38739640 has 32 divisors (see below), whose sum is σ = 88364880. Its totient is φ = 15282432.

The previous prime is 38739607. The next prime is 38739641. The reversal of 38739640 is 4693783.

It is a Smith number, since the sum of its digits (40) 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 (40).

It is a junction number, because it is equal to n+sod(n) for n = 38739593 and 38739602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38739641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3714 + ... + 9553.

Almost surely, 2^38739640 is an apocalyptic number.

It is an amenable number.

38739640 is an abundant number, since it is smaller than the sum of its proper divisors (49625240).

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

38739640 is a wasteful number, since it uses less digits than its factorization.

38739640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13351 (or 13347 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 38739640 is about 6224.1176081433. The cubic root of 38739640 is about 338.3648127396.

The spelling of 38739640 in words is "thirty-eight million, seven hundred thirty-nine thousand, six hundred forty".