31042340 has 48 divisors (see below), whose sum is σ = 78890112. Its totient is φ = 10016256.

The previous prime is 31042337. The next prime is 31042367. The reversal of 31042340 is 4324013.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4142 + ... + 8901.

It is an arithmetic number, because the mean of its divisors is an integer number (1643544).

Almost surely, 2^31042340 is an apocalyptic number.

It is an amenable number.

31042340 is an abundant number, since it is smaller than the sum of its proper divisors (47847772).

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

31042340 is a wasteful number, since it uses less digits than its factorization.

31042340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13076 (or 13074 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31042340 is about 5571.5653096773. The cubic root of 31042340 is about 314.2810174426.

Adding to 31042340 its reverse (4324013), we get a palindrome (35366353).

The spelling of 31042340 in words is "thirty-one million, forty-two thousand, three hundred forty".