31423536 has 60 divisors (see below), whose sum is σ = 89282232. Its totient is φ = 10315008.

The previous prime is 31423529. The next prime is 31423573. The reversal of 31423536 is 63532413.

It is a happy number.

It is a super-2 number, since 2×31423536² = 1974877229486592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8020 + ... + 11276.

Almost surely, 2^31423536 is an apocalyptic number.

31423536 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31423536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44641116).

31423536 is an abundant number, since it is smaller than the sum of its proper divisors (57858696).

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

31423536 is a wasteful number, since it uses less digits than its factorization.

31423536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338 (or 3329 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 31423536 is about 5605.6699867188. The cubic root of 31423536 is about 315.5622309711.

Adding to 31423536 its reverse (63532413), we get a palindrome (94955949).

The spelling of 31423536 in words is "thirty-one million, four hundred twenty-three thousand, five hundred thirty-six".