31708442 has 4 divisors (see below), whose sum is σ = 47562666. Its totient is φ = 15854220.

The previous prime is 31708441. The next prime is 31708477. The reversal of 31708442 is 24480713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31685641 + 22801 = 5629^2 + 151^2 .

It is not an unprimeable number, because it can be changed into a prime (31708441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7927109 + ... + 7927112.

Almost surely, 2^31708442 is an apocalyptic number.

31708442 is a deficient number, since it is larger than the sum of its proper divisors (15854224).

31708442 is a wasteful number, since it uses less digits than its factorization.

31708442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15854223.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 31708442 is about 5631.0249511079. The cubic root of 31708442 is about 316.5130598812.

The spelling of 31708442 in words is "thirty-one million, seven hundred eight thousand, four hundred forty-two".