38921988 has 48 divisors (see below), whose sum is σ = 107147264. Its totient is φ = 10761120.

The previous prime is 38921983. The next prime is 38921989. The reversal of 38921988 is 88912983.

It is a happy number.

It is a super-2 number, since 2×38921988² = 3029842299744288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38921983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4870 + ... + 10077.

Almost surely, 2^38921988 is an apocalyptic number.

It is an amenable number.

38921988 is an abundant number, since it is smaller than the sum of its proper divisors (68225276).

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

38921988 is a wasteful number, since it uses less digits than its factorization.

38921988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14992 (or 14990 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 38921988 is about 6238.7489130434. The cubic root of 38921988 is about 338.8948778222.

The spelling of 38921988 in words is "thirty-eight million, nine hundred twenty-one thousand, nine hundred eighty-eight".