37881139 has 4 divisors (see below), whose sum is σ = 38170440. Its totient is φ = 37591840.

The previous prime is 37881133. The next prime is 37881169. The reversal of 37881139 is 93118873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93118873 = 73 ⋅1275601.

It is a cyclic number.

It is not a de Polignac number, because 37881139 - 2³ = 37881131 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37881131) 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, 144454 + ... + 144715.

It is an arithmetic number, because the mean of its divisors is an integer number (9542610).

Almost surely, 2^37881139 is an apocalyptic number.

37881139 is a deficient number, since it is larger than the sum of its proper divisors (289301).

37881139 is a wasteful number, since it uses less digits than its factorization.

37881139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289300.

The product of its digits is 36288, while the sum is 40.

The square root of 37881139 is about 6154.7655519930. The cubic root of 37881139 is about 335.8466414417.

The spelling of 37881139 in words is "thirty-seven million, eight hundred eighty-one thousand, one hundred thirty-nine".