38721620 has 48 divisors (see below), whose sum is σ = 97829760. Its totient is φ = 12576384.

The previous prime is 38721611. The next prime is 38721643. The reversal of 38721620 is 2612783.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4619 + ... + 9938.

It is an arithmetic number, because the mean of its divisors is an integer number (2038120).

Almost surely, 2^38721620 is an apocalyptic number.

It is an amenable number.

38721620 is an abundant number, since it is smaller than the sum of its proper divisors (59108140).

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

38721620 is a wasteful number, since it uses less digits than its factorization.

38721620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14592 (or 14590 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 38721620 is about 6222.6698450103. The cubic root of 38721620 is about 338.3123403920.

The spelling of 38721620 in words is "thirty-eight million, seven hundred twenty-one thousand, six hundred twenty".