38991678 has 32 divisors (see below), whose sum is σ = 85300992. Its totient is φ = 11784000.

The previous prime is 38991649. The next prime is 38991679. The reversal of 38991678 is 87619983.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38991678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38991679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39175 + ... + 40157.

It is an arithmetic number, because the mean of its divisors is an integer number (2665656).

Almost surely, 2^38991678 is an apocalyptic number.

38991678 is an abundant number, since it is smaller than the sum of its proper divisors (46309314).

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

38991678 is a wasteful number, since it uses less digits than its factorization.

38991678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its digits is 653184, while the sum is 51.

The square root of 38991678 is about 6244.3316696024. The cubic root of 38991678 is about 339.0970215072.

The spelling of 38991678 in words is "thirty-eight million, nine hundred ninety-one thousand, six hundred seventy-eight".