31420408 has 8 divisors (see below), whose sum is σ = 58913280. Its totient is φ = 15710200.

The previous prime is 31420381. The next prime is 31420409. The reversal of 31420408 is 80402413.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1963768 + ... + 1963783.

It is an arithmetic number, because the mean of its divisors is an integer number (7364160).

Almost surely, 2^31420408 is an apocalyptic number.

It is an amenable number.

31420408 is a deficient number, since it is larger than the sum of its proper divisors (27492872).

31420408 is a wasteful number, since it uses less digits than its factorization.

31420408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3927557 (or 3927553 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 31420408 is about 5605.3909765511. The cubic root of 31420408 is about 315.5517599300.

The spelling of 31420408 in words is "thirty-one million, four hundred twenty thousand, four hundred eight".