38812491 has 6 divisors (see below), whose sum is σ = 56062500. Its totient is φ = 25874988.

The previous prime is 38812453. The next prime is 38812507. The reversal of 38812491 is 19421883.

It is not a de Polignac number, because 38812491 - 2¹⁰ = 38811467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38812451) 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, 2156241 + ... + 2156258.

It is an arithmetic number, because the mean of its divisors is an integer number (9343750).

Almost surely, 2^38812491 is an apocalyptic number.

38812491 is a deficient number, since it is larger than the sum of its proper divisors (17250009).

38812491 is a wasteful number, since it uses less digits than its factorization.

38812491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312505 (or 4312502 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 38812491 is about 6229.9671748734. The cubic root of 38812491 is about 338.5767814904.

Subtracting from 38812491 its sum of digits (36), we obtain a triangular number (38812455 = T₈₈₁₀).

The spelling of 38812491 in words is "thirty-eight million, eight hundred twelve thousand, four hundred ninety-one".