31396857 has 8 divisors (see below), whose sum is σ = 42883680. Its totient is φ = 20420640.

The previous prime is 31396853. The next prime is 31396861. The reversal of 31396857 is 75869313.

It is an interprime number because it is at equal distance from previous prime (31396853) and next prime (31396861).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31396857 - 2² = 31396853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31396853) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 127507 + ... + 127752.

It is an arithmetic number, because the mean of its divisors is an integer number (5360460).

Almost surely, 2^31396857 is an apocalyptic number.

It is an amenable number.

31396857 is a deficient number, since it is larger than the sum of its proper divisors (11486823).

31396857 is a wasteful number, since it uses less digits than its factorization.

31396857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255303.

The product of its digits is 136080, while the sum is 42.

The square root of 31396857 is about 5603.2898372296. The cubic root of 31396857 is about 315.4729001749.

The spelling of 31396857 in words is "thirty-one million, three hundred ninety-six thousand, eight hundred fifty-seven".