37881138 has 32 divisors (see below), whose sum is σ = 79399296. Its totient is φ = 12025728.

The previous prime is 37881133. The next prime is 37881169. The reversal of 37881138 is 83118873.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 37881096 and 37881105.

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 15 ways as a sum of consecutive naturals, for example, 42756 + ... + 43632.

It is an arithmetic number, because the mean of its divisors is an integer number (2481228).

Almost surely, 2^37881138 is an apocalyptic number.

37881138 is an abundant number, since it is smaller than the sum of its proper divisors (41518158).

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

37881138 is a wasteful number, since it uses less digits than its factorization.

37881138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its digits is 32256, while the sum is 39.

The square root of 37881138 is about 6154.7654707552. The cubic root of 37881138 is about 335.8466384864.

The spelling of 37881138 in words is "thirty-seven million, eight hundred eighty-one thousand, one hundred thirty-eight".