31139422 has 8 divisors (see below), whose sum is σ = 47971656. Its totient is φ = 15148872.

The previous prime is 31139413. The next prime is 31139429. The reversal of 31139422 is 22493113.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31139429) 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, 210328 + ... + 210475.

It is an arithmetic number, because the mean of its divisors is an integer number (5996457).

Almost surely, 2^31139422 is an apocalyptic number.

31139422 is a deficient number, since it is larger than the sum of its proper divisors (16832234).

31139422 is a wasteful number, since it uses less digits than its factorization.

31139422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420842.

The product of its digits is 1296, while the sum is 25.

The square root of 31139422 is about 5580.2707819603. The cubic root of 31139422 is about 314.6083046047.

The spelling of 31139422 in words is "thirty-one million, one hundred thirty-nine thousand, four hundred twenty-two".