31398645 has 8 divisors (see below), whose sum is σ = 50237856. Its totient is φ = 16745936.

The previous prime is 31398641. The next prime is 31398667. The reversal of 31398645 is 54689313.

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

It is a cyclic number.

It is not a de Polignac number, because 31398645 - 2² = 31398641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31398641) 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, 1046607 + ... + 1046636.

It is an arithmetic number, because the mean of its divisors is an integer number (6279732).

Almost surely, 2^31398645 is an apocalyptic number.

It is an amenable number.

31398645 is a deficient number, since it is larger than the sum of its proper divisors (18839211).

31398645 is a wasteful number, since it uses less digits than its factorization.

31398645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093251.

The product of its digits is 77760, while the sum is 39.

The square root of 31398645 is about 5603.4493840848. The cubic root of 31398645 is about 315.4788886176.

The spelling of 31398645 in words is "thirty-one million, three hundred ninety-eight thousand, six hundred forty-five".