38991100 has 18 divisors (see below), whose sum is σ = 84610904. Its totient is φ = 15596400.

The previous prime is 38991089. The next prime is 38991101. The reversal of 38991100 is 119983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38991101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 194856 + ... + 195055.

Almost surely, 2^38991100 is an apocalyptic number.

It is an amenable number.

38991100 is an abundant number, since it is smaller than the sum of its proper divisors (45619804).

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

38991100 is a wasteful number, since it uses less digits than its factorization.

38991100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389925 (or 389918 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 38991100 is about 6244.2853874563. The cubic root of 38991100 is about 339.0953459441.

The spelling of 38991100 in words is "thirty-eight million, nine hundred ninety-one thousand, one hundred".