31189842 has 24 divisors (see below), whose sum is σ = 68238144. Its totient is φ = 10295064.

The previous prime is 31189841. The next prime is 31189843. The reversal of 31189842 is 24898113.

It is an interprime number because it is at equal distance from previous prime (31189841) and next prime (31189843).

It is a junction number, because it is equal to n+sod(n) for n = 31189797 and 31189806.

It is not an unprimeable number, because it can be changed into a prime (31189841) 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, 6558 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (2843256).

Almost surely, 2^31189842 is an apocalyptic number.

31189842 is an abundant number, since it is smaller than the sum of its proper divisors (37048302).

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

31189842 is a wasteful number, since it uses less digits than its factorization.

31189842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16934 (or 16931 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 31189842 is about 5584.7866566235. The cubic root of 31189842 is about 314.7780144238.

The spelling of 31189842 in words is "thirty-one million, one hundred eighty-nine thousand, eight hundred forty-two".