320156397 has 12 divisors (see below), whose sum is σ = 504489024. Its totient is φ = 194034120.

The previous prime is 320156387. The next prime is 320156399. The reversal of 320156397 is 793651023.

320156397 is a `hidden beast` number, since 3 + 2 + 0 + 1 + 563 + 97 = 666.

It is not a de Polignac number, because 320156397 - 2⁸ = 320156141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320156399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1616853 + ... + 1617050.

It is an arithmetic number, because the mean of its divisors is an integer number (42040752).

Almost surely, 2^320156397 is an apocalyptic number.

It is an amenable number.

320156397 is a deficient number, since it is larger than the sum of its proper divisors (184332627).

320156397 is a wasteful number, since it uses less digits than its factorization.

320156397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233920 (or 3233917 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 320156397 is about 17892.9147150485. The cubic root of 320156397 is about 684.1017918170.

The spelling of 320156397 in words is "three hundred twenty million, one hundred fifty-six thousand, three hundred ninety-seven".