31245408 has 144 divisors (see below), whose sum is σ = 95528160. Its totient is φ = 9664512.

The previous prime is 31245377. The next prime is 31245413. The reversal of 31245408 is 80454213.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351028 + ... + 351116.

It is an arithmetic number, because the mean of its divisors is an integer number (663390).

Almost surely, 2^31245408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31245408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47764080).

31245408 is an abundant number, since it is smaller than the sum of its proper divisors (64282752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31245408 is a wasteful number, since it uses less digits than its factorization.

31245408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 31245408 is about 5589.7592076940. The cubic root of 31245408 is about 314.9648335647.

The spelling of 31245408 in words is "thirty-one million, two hundred forty-five thousand, four hundred eight".