31442746 has 4 divisors (see below), whose sum is σ = 47164122. Its totient is φ = 15721372.

The previous prime is 31442737. The next prime is 31442783. The reversal of 31442746 is 64724413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64724413 = 13 ⋅4978801.

It can be written as a sum of positive squares in only one way, i.e., 24393721 + 7049025 = 4939^2 + 2655^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860685 + ... + 7860688.

Almost surely, 2^31442746 is an apocalyptic number.

31442746 is a deficient number, since it is larger than the sum of its proper divisors (15721376).

31442746 is a wasteful number, since it uses less digits than its factorization.

31442746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15721375.

The product of its digits is 16128, while the sum is 31.

The square root of 31442746 is about 5607.3831686447. The cubic root of 31442746 is about 315.6265215886.

The spelling of 31442746 in words is "thirty-one million, four hundred forty-two thousand, seven hundred forty-six".