38991078 has 128 divisors (see below), whose sum is σ = 107136000. Its totient is φ = 10264320.

The previous prime is 38991061. The next prime is 38991089. The reversal of 38991078 is 87019983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 438058 + ... + 438146.

It is an arithmetic number, because the mean of its divisors is an integer number (837000).

Almost surely, 2^38991078 is an apocalyptic number.

38991078 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 38991078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53568000).

38991078 is an abundant number, since it is smaller than the sum of its proper divisors (68144922).

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

38991078 is a wasteful number, since it uses less digits than its factorization.

38991078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 38991078 is about 6244.2836258453. The cubic root of 38991078 is about 339.0952821681.

The spelling of 38991078 in words is "thirty-eight million, nine hundred ninety-one thousand, seventy-eight".