31214304 has 144 divisors (see below), whose sum is σ = 99066240. Its totient is φ = 9242880.

The previous prime is 31214291. The next prime is 31214317. The reversal of 31214304 is 40341213.

It is an interprime number because it is at equal distance from previous prime (31214291) and next prime (31214317).

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186829 + ... + 186995.

It is an arithmetic number, because the mean of its divisors is an integer number (687960).

Almost surely, 2^31214304 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 31214304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49533120).

31214304 is an abundant number, since it is smaller than the sum of its proper divisors (67851936).

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

31214304 is a wasteful number, since it uses less digits than its factorization.

31214304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31214304 is about 5586.9762841809. The cubic root of 31214304 is about 314.8602857353.

Adding to 31214304 its reverse (40341213), we get a palindrome (71555517).

The spelling of 31214304 in words is "thirty-one million, two hundred fourteen thousand, three hundred four".