31138874 has 8 divisors (see below), whose sum is σ = 50301300. Its totient is φ = 14371776.

The previous prime is 31138873. The next prime is 31138879. The reversal of 31138874 is 47883113.

31138874 = 367² + 368² + ... + 522².

It can be written as a sum of positive squares in 2 ways, for example, as 29430625 + 1708249 = 5425^2 + 1307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31138871) 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 3 ways as a sum of consecutive naturals, for example, 598799 + ... + 598850.

Almost surely, 2^31138874 is an apocalyptic number.

31138874 is a deficient number, since it is larger than the sum of its proper divisors (19162426).

31138874 is a wasteful number, since it uses less digits than its factorization.

31138874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197664.

The product of its digits is 16128, while the sum is 35.

The square root of 31138874 is about 5580.2216801844. The cubic root of 31138874 is about 314.6064590731.

The spelling of 31138874 in words is "thirty-one million, one hundred thirty-eight thousand, eight hundred seventy-four".