31442236 has 12 divisors (see below), whose sum is σ = 62884528. Its totient is φ = 13475232.

The previous prime is 31442189. The next prime is 31442239. The reversal of 31442236 is 63224413.

31442236 is an admirable number.

It is a super-2 number, since 2×31442236² = 1977228409359392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31442236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561441 + ... + 561496.

Almost surely, 2^31442236 is an apocalyptic number.

It is an amenable number.

31442236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31442236 is a wasteful number, since it uses less digits than its factorization.

31442236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122948 (or 1122946 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 31442236 is about 5607.3376927023. The cubic root of 31442236 is about 315.6248150965.

Adding to 31442236 its reverse (63224413), we get a palindrome (94666649).

The spelling of 31442236 in words is "thirty-one million, four hundred forty-two thousand, two hundred thirty-six".