31421396 has 6 divisors (see below), whose sum is σ = 54987450. Its totient is φ = 15710696.

The previous prime is 31421387. The next prime is 31421417. The reversal of 31421396 is 69312413.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 15132100 = 4036^2 + 3890^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3927671 + ... + 3927678.

It is an arithmetic number, because the mean of its divisors is an integer number (9164575).

Almost surely, 2^31421396 is an apocalyptic number.

It is an amenable number.

31421396 is a deficient number, since it is larger than the sum of its proper divisors (23566054).

31421396 is a wasteful number, since it uses less digits than its factorization.

31421396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7855353 (or 7855351 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 31421396 is about 5605.4791053040. The cubic root of 31421396 is about 315.5550673543. Note that the first 3 decimals are identical.

The spelling of 31421396 in words is "thirty-one million, four hundred twenty-one thousand, three hundred ninety-six".