31000842 has 24 divisors (see below), whose sum is σ = 68309280. Its totient is φ = 10158120.

The previous prime is 31000841. The next prime is 31000847. The reversal of 31000842 is 24800013.

It is a happy number.

It is a super-2 number, since 2×31000842² = 1922104409417928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31000841) 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, 13534 + ... + 15657.

It is an arithmetic number, because the mean of its divisors is an integer number (2846220).

Almost surely, 2^31000842 is an apocalyptic number.

31000842 is an abundant number, since it is smaller than the sum of its proper divisors (37308438).

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

31000842 is a wasteful number, since it uses less digits than its factorization.

31000842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29258 (or 29255 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 31000842 is about 5567.8399761487. The cubic root of 31000842 is about 314.1409093451.

Adding to 31000842 its reverse (24800013), we get a palindrome (55800855).

The spelling of 31000842 in words is "thirty-one million, eight hundred forty-two", and thus it is an aban number.