38121620 has 24 divisors (see below), whose sum is σ = 80645544. Its totient is φ = 15136256.

The previous prime is 38121617. The next prime is 38121659. The reversal of 38121620 is 2612183.

It can be written as a sum of positive squares in 4 ways, for example, as 6895876 + 31225744 = 2626^2 + 5588^2 .

It is a super-2 number, since 2×38121620² = 2906515822848800, which contains 22 as substring.

It is a congruent number.

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, 4217 + ... + 9696.

It is an arithmetic number, because the mean of its divisors is an integer number (3360231).

Almost surely, 2^38121620 is an apocalyptic number.

It is an amenable number.

38121620 is an abundant number, since it is smaller than the sum of its proper divisors (42523924).

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

38121620 is a wasteful number, since it uses less digits than its factorization.

38121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14059 (or 14057 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 38121620 is about 6174.2708071480. The cubic root of 38121620 is about 336.5558284070. Note that the first 3 decimals are identical.

The spelling of 38121620 in words is "thirty-eight million, one hundred twenty-one thousand, six hundred twenty".