31389634 has 16 divisors (see below), whose sum is σ = 50306400. Its totient is φ = 14645664.

The previous prime is 31389601. The next prime is 31389637. The reversal of 31389634 is 43698313.

It is a junction number, because it is equal to n+sod(n) for n = 31389593 and 31389602.

It is not an unprimeable number, because it can be changed into a prime (31389637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3619 + ... + 8710.

It is an arithmetic number, because the mean of its divisors is an integer number (3144150).

Almost surely, 2^31389634 is an apocalyptic number.

31389634 is a deficient number, since it is larger than the sum of its proper divisors (18916766).

31389634 is a wasteful number, since it uses less digits than its factorization.

31389634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12417.

The product of its digits is 46656, while the sum is 37.

The square root of 31389634 is about 5602.6452680854. The cubic root of 31389634 is about 315.4487062934.

It can be divided in two parts, 31389 and 634, that added together give a palindrome (32023).

The spelling of 31389634 in words is "thirty-one million, three hundred eighty-nine thousand, six hundred thirty-four".