31389460 has 12 divisors (see below), whose sum is σ = 65917908. Its totient is φ = 12555776.

The previous prime is 31389451. The next prime is 31389461. The reversal of 31389460 is 6498313.

It can be written as a sum of positive squares in 2 ways, for example, as 10850436 + 20539024 = 3294^2 + 4532^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31389461) 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, 784717 + ... + 784756.

It is an arithmetic number, because the mean of its divisors is an integer number (5493159).

Almost surely, 2^31389460 is an apocalyptic number.

It is an amenable number.

31389460 is an abundant number, since it is smaller than the sum of its proper divisors (34528448).

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

31389460 is a wasteful number, since it uses less digits than its factorization.

31389460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569482 (or 1569480 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 31389460 is about 5602.6297396847. The cubic root of 31389460 is about 315.4481234239.

The spelling of 31389460 in words is "thirty-one million, three hundred eighty-nine thousand, four hundred sixty".