31704397 has 4 divisors (see below), whose sum is σ = 31734396. Its totient is φ = 31674400.

The previous prime is 31704389. The next prime is 31704433. The reversal of 31704397 is 79340713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79340713 = 19 ⋅4175827.

It can be written as a sum of positive squares in 2 ways, for example, as 24147396 + 7557001 = 4914^2 + 2749^2 .

It is a cyclic number.

It is not a de Polignac number, because 31704397 - 2³ = 31704389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31704347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13354 + ... + 15547.

It is an arithmetic number, because the mean of its divisors is an integer number (7933599).

Almost surely, 2^31704397 is an apocalyptic number.

It is an amenable number.

31704397 is a deficient number, since it is larger than the sum of its proper divisors (29999).

31704397 is a wasteful number, since it uses less digits than its factorization.

31704397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29998.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 31704397 is about 5630.6657688057. The cubic root of 31704397 is about 316.4996002714.

The spelling of 31704397 in words is "thirty-one million, seven hundred four thousand, three hundred ninety-seven".