31640794 has 4 divisors (see below), whose sum is σ = 47461194. Its totient is φ = 15820396.

The previous prime is 31640789. The next prime is 31640797. The reversal of 31640794 is 49704613.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49704613 = 7 ⋅7100659.

It can be written as a sum of positive squares in only one way, i.e., 31640625 + 169 = 5625^2 + 13^2 .

It is a super-2 number, since 2×31640794² = 2002279689900872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31640797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7910197 + ... + 7910200.

Almost surely, 2^31640794 is an apocalyptic number.

31640794 is a deficient number, since it is larger than the sum of its proper divisors (15820400).

31640794 is a wasteful number, since it uses less digits than its factorization.

31640794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15820399.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 31640794 is about 5625.0150222022. The cubic root of 31640794 is about 316.2878126086.

The spelling of 31640794 in words is "thirty-one million, six hundred forty thousand, seven hundred ninety-four".