39497640 has 128 divisors (see below), whose sum is σ = 145877760. Its totient is φ = 8331264.

The previous prime is 39497621. The next prime is 39497657. The reversal of 39497640 is 4679493.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 39497592 and 39497601.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9112 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (1139670).

Almost surely, 2^39497640 is an apocalyptic number.

39497640 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 39497640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72938880).

39497640 is an abundant number, since it is smaller than the sum of its proper divisors (106380120).

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

39497640 is a wasteful number, since it uses less digits than its factorization.

39497640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651 (or 3647 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 39497640 is about 6284.7147906647. The cubic root of 39497640 is about 340.5574477044.

The spelling of 39497640 in words is "thirty-nine million, four hundred ninety-seven thousand, six hundred forty".