31044138 has 16 divisors (see below), whose sum is σ = 65356320. Its totient is φ = 9803376.

The previous prime is 31044137. The next prime is 31044173. The reversal of 31044138 is 83144013.

It is a super-3 number, since 3×31044138³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31044133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136045 + ... + 136272.

It is an arithmetic number, because the mean of its divisors is an integer number (4084770).

Almost surely, 2^31044138 is an apocalyptic number.

31044138 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31044138 is an abundant number, since it is smaller than the sum of its proper divisors (34312182).

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

31044138 is a wasteful number, since it uses less digits than its factorization.

31044138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272341.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 31044138 is about 5571.7266623552. The cubic root of 31044138 is about 314.2870851377.

The spelling of 31044138 in words is "thirty-one million, forty-four thousand, one hundred thirty-eight".