31342518 has 16 divisors (see below), whose sum is σ = 69650160. Its totient is φ = 10447488.

The previous prime is 31342513. The next prime is 31342529. The reversal of 31342518 is 81524313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31342491 and 31342500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31342513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290155 + ... + 290262.

It is an arithmetic number, because the mean of its divisors is an integer number (4353135).

Almost surely, 2^31342518 is an apocalyptic number.

31342518 is an abundant number, since it is smaller than the sum of its proper divisors (38307642).

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

31342518 is a wasteful number, since it uses less digits than its factorization.

31342518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580428 (or 580422 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 31342518 is about 5598.4388895477. The cubic root of 31342518 is about 315.2907972230.

The spelling of 31342518 in words is "thirty-one million, three hundred forty-two thousand, five hundred eighteen".