31694397 has 16 divisors (see below), whose sum is σ = 49420800. Its totient is φ = 17689392.

The previous prime is 31694359. The next prime is 31694401. The reversal of 31694397 is 79349613.

It is not a de Polignac number, because 31694397 - 2⁸ = 31694141 is a prime.

It is a super-4 number, since 4×31694397⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31694347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16647 + ... + 18452.

It is an arithmetic number, because the mean of its divisors is an integer number (3088800).

Almost surely, 2^31694397 is an apocalyptic number.

It is an amenable number.

31694397 is a deficient number, since it is larger than the sum of its proper divisors (17726403).

31694397 is a wasteful number, since it uses less digits than its factorization.

31694397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35152.

The product of its digits is 122472, while the sum is 42.

The square root of 31694397 is about 5629.7777043148. Note that the first 4 decimals coincide. The cubic root of 31694397 is about 316.4663206727.

The spelling of 31694397 in words is "thirty-one million, six hundred ninety-four thousand, three hundred ninety-seven".