39494640 has 120 divisors (see below), whose sum is σ = 126755280. Its totient is φ = 10171392.

The previous prime is 39494639. The next prime is 39494641. The reversal of 39494640 is 4649493.

39494640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (39494639) and next prime (39494641).

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39494641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 443716 + ... + 443804.

It is an arithmetic number, because the mean of its divisors is an integer number (1056294).

Almost surely, 2^39494640 is an apocalyptic number.

39494640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39494640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63377640).

39494640 is an abundant number, since it is smaller than the sum of its proper divisors (87260640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39494640 is a wasteful number, since it uses less digits than its factorization.

39494640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 39494640 is about 6284.4761118171. The cubic root of 39494640 is about 340.5488252634.

The spelling of 39494640 in words is "thirty-nine million, four hundred ninety-four thousand, six hundred forty".