31421894 has 16 divisors (see below), whose sum is σ = 54144288. Its totient is φ = 13396992.

The previous prime is 31421881. The next prime is 31421939. The reversal of 31421894 is 49812413.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31421894.

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 in 7 ways as a sum of consecutive naturals, for example, 2939 + ... + 8454.

It is an arithmetic number, because the mean of its divisors is an integer number (3384018).

Almost surely, 2^31421894 is an apocalyptic number.

31421894 is a deficient number, since it is larger than the sum of its proper divisors (22722394).

31421894 is a wasteful number, since it uses less digits than its factorization.

31421894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11599.

The product of its digits is 6912, while the sum is 32.

The square root of 31421894 is about 5605.5235259519. The cubic root of 31421894 is about 315.5567344306.

The spelling of 31421894 in words is "thirty-one million, four hundred twenty-one thousand, eight hundred ninety-four".