31382138 has 8 divisors (see below), whose sum is σ = 48221460. Its totient is φ = 15308320.

The previous prime is 31382123. The next prime is 31382171. The reversal of 31382138 is 83128313.

It can be written as a sum of positive squares in 2 ways, for example, as 31281649 + 100489 = 5593^2 + 317^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 31382138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191273 + ... + 191436.

Almost surely, 2^31382138 is an apocalyptic number.

31382138 is a deficient number, since it is larger than the sum of its proper divisors (16839322).

31382138 is a wasteful number, since it uses less digits than its factorization.

31382138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382752.

The product of its digits is 3456, while the sum is 29.

The square root of 31382138 is about 5601.9762584288. The cubic root of 31382138 is about 315.4235940567.

It can be divided in two parts, 31 and 382138, that multiplied together give a triangular number (11846278 = T₄₈₆₇).

The spelling of 31382138 in words is "thirty-one million, three hundred eighty-two thousand, one hundred thirty-eight".