31396224 has 32 divisors (see below), whose sum is σ = 83397240. Its totient is φ = 10465280.

The previous prime is 31396223. The next prime is 31396231. The reversal of 31396224 is 42269313.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 31396191 and 31396200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31396223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40497 + ... + 41264.

Almost surely, 2^31396224 is an apocalyptic number.

It is an amenable number.

31396224 is an abundant number, since it is smaller than the sum of its proper divisors (52001016).

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

31396224 is an equidigital number, since it uses as much as digits as its factorization.

31396224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81778 (or 81766 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 31396224 is about 5603.2333522708. The cubic root of 31396224 is about 315.4707800509.

The spelling of 31396224 in words is "thirty-one million, three hundred ninety-six thousand, two hundred twenty-four".