31389696 has 144 divisors (see below), whose sum is σ = 98378280. Its totient is φ = 9584640.

The previous prime is 31389671. The next prime is 31389697. The reversal of 31389696 is 69698313.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31389697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239551 + ... + 239681.

Almost surely, 2^31389696 is an apocalyptic number.

31389696 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 31389696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49189140).

31389696 is an abundant number, since it is smaller than the sum of its proper divisors (66988584).

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

31389696 is a wasteful number, since it uses less digits than its factorization.

31389696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 149 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 31389696 is about 5602.6508011833. The cubic root of 31389696 is about 315.4489139819.

It can be divided in two parts, 313 and 89696, that added together give a palindrome (90009).

The spelling of 31389696 in words is "thirty-one million, three hundred eighty-nine thousand, six hundred ninety-six".