39640256 has 28 divisors (see below), whose sum is σ = 79296768. Its totient is φ = 19660032.

The previous prime is 39640253. The next prime is 39640259. The reversal of 39640256 is 65204693.

It is an interprime number because it is at equal distance from previous prime (39640253) and next prime (39640259).

39640256 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (39640253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5690 + ... + 10566.

Almost surely, 2^39640256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39640256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39648384).

39640256 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

39640256 is a wasteful number, since it uses less digits than its factorization.

39640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 39640256 is about 6296.0508257161. The cubic root of 39640256 is about 340.9668443267.

The spelling of 39640256 in words is "thirty-nine million, six hundred forty thousand, two hundred fifty-six".