31042386 has 16 divisors (see below), whose sum is σ = 68983200. Its totient is φ = 10347444.

The previous prime is 31042381. The next prime is 31042393. The reversal of 31042386 is 68324013.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (31042381) 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, 287376 + ... + 287483.

It is an arithmetic number, because the mean of its divisors is an integer number (4311450).

Almost surely, 2^31042386 is an apocalyptic number.

31042386 is an abundant number, since it is smaller than the sum of its proper divisors (37940814).

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

31042386 is a wasteful number, since it uses less digits than its factorization.

31042386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574870 (or 574864 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31042386 is about 5571.5694377796. The cubic root of 31042386 is about 314.2811726813.

Adding to 31042386 its reverse (68324013), we get a palindrome (99366399).

The spelling of 31042386 in words is "thirty-one million, forty-two thousand, three hundred eighty-six".