38785991 has 4 divisors (see below), whose sum is σ = 40037184. Its totient is φ = 37534800.

The previous prime is 38785987. The next prime is 38785997. The reversal of 38785991 is 19958783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19958783 = 13 ⋅1535291.

It is not a de Polignac number, because 38785991 - 2² = 38785987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38785997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625550 + ... + 625611.

It is an arithmetic number, because the mean of its divisors is an integer number (10009296).

Almost surely, 2^38785991 is an apocalyptic number.

38785991 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

38785991 is a deficient number, since it is larger than the sum of its proper divisors (1251193).

38785991 is a wasteful number, since it uses less digits than its factorization.

38785991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251192.

The product of its digits is 544320, while the sum is 50.

The square root of 38785991 is about 6227.8399947333. The cubic root of 38785991 is about 338.4997072697.

The spelling of 38785991 in words is "thirty-eight million, seven hundred eighty-five thousand, nine hundred ninety-one".