31398224 has 40 divisors (see below), whose sum is σ = 71474592. Its totient is φ = 13173120.

The previous prime is 31398217. The next prime is 31398239. The reversal of 31398224 is 42289313.

It is a happy number.

It is a super-3 number, since 3×31398224³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4574 + ... + 9149.

Almost surely, 2^31398224 is an apocalyptic number.

It is an amenable number.

31398224 is an abundant number, since it is smaller than the sum of its proper divisors (40076368).

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

31398224 is a wasteful number, since it uses less digits than its factorization.

31398224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755 (or 13749 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 31398224 is about 5603.4118178124. The cubic root of 31398224 is about 315.4774786077.

The spelling of 31398224 in words is "thirty-one million, three hundred ninety-eight thousand, two hundred twenty-four".