39965940 has 192 divisors, whose sum is σ = 144883200. Its totient is φ = 8957952.

The previous prime is 39965923. The next prime is 39965983. The reversal of 39965940 is 4956993.

It is a happy number.

39965940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 366606 + ... + 366714.

It is an arithmetic number, because the mean of its divisors is an integer number (754600).

Almost surely, 2^39965940 is an apocalyptic number.

39965940 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 39965940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72441600).

39965940 is an abundant number, since it is smaller than the sum of its proper divisors (104917260).

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

39965940 is a wasteful number, since it uses less digits than its factorization.

39965940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 39965940 is about 6321.8620674608. The cubic root of 39965940 is about 341.8980921361.

The spelling of 39965940 in words is "thirty-nine million, nine hundred sixty-five thousand, nine hundred forty".