31443393 has 16 divisors (see below), whose sum is σ = 43520000. Its totient is φ = 20172240.

The previous prime is 31443389. The next prime is 31443397. The reversal of 31443393 is 39334413.

It is an interprime number because it is at equal distance from previous prime (31443389) and next prime (31443397).

It is not a de Polignac number, because 31443393 - 2² = 31443389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31443393.

It is not an unprimeable number, because it can be changed into a prime (31443397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17658 + ... + 19356.

It is an arithmetic number, because the mean of its divisors is an integer number (2720000).

Almost surely, 2^31443393 is an apocalyptic number.

It is an amenable number.

31443393 is a deficient number, since it is larger than the sum of its proper divisors (12076607).

31443393 is a wasteful number, since it uses less digits than its factorization.

31443393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932.

The product of its digits is 11664, while the sum is 30.

The square root of 31443393 is about 5607.4408601429. The cubic root of 31443393 is about 315.6286864648.

The spelling of 31443393 in words is "thirty-one million, four hundred forty-three thousand, three hundred ninety-three".