31707842 has 16 divisors (see below), whose sum is σ = 49398552. Its totient is φ = 15252480.

The previous prime is 31707821. The next prime is 31707847. The reversal of 31707842 is 24870713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25210441 + 6497401 = 5021^2 + 2549^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31707799 and 31707808.

It is not an unprimeable number, because it can be changed into a prime (31707847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3338 + ... + 8634.

Almost surely, 2^31707842 is an apocalyptic number.

31707842 is a deficient number, since it is larger than the sum of its proper divisors (17690710).

31707842 is a wasteful number, since it uses less digits than its factorization.

31707842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5413.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 31707842 is about 5630.9716745869. The cubic root of 31707842 is about 316.5110634724.

The spelling of 31707842 in words is "thirty-one million, seven hundred seven thousand, eight hundred forty-two".