38409640 has 32 divisors (see below), whose sum is σ = 90972000. Its totient is φ = 14554944.

The previous prime is 38409619. The next prime is 38409653. The reversal of 38409640 is 4690483.

It is a junction number, because it is equal to n+sod(n) for n = 38409596 and 38409605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24510 + ... + 26029.

It is an arithmetic number, because the mean of its divisors is an integer number (2842875).

Almost surely, 2^38409640 is an apocalyptic number.

It is an amenable number.

38409640 is an abundant number, since it is smaller than the sum of its proper divisors (52562360).

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

38409640 is a wasteful number, since it uses less digits than its factorization.

38409640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50569 (or 50565 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 38409640 is about 6197.5511292768. The cubic root of 38409640 is about 337.4012953242.

The spelling of 38409640 in words is "thirty-eight million, four hundred nine thousand, six hundred forty".