397520255709 has 12 divisors (see below), whose sum is σ = 581464228800. Its totient is φ = 261658902024.

The previous prime is 397520255689. The next prime is 397520255753. The reversal of 397520255709 is 907552025793.

397520255709 is a `hidden beast` number, since 3 + 97 + 520 + 25 + 5 + 7 + 0 + 9 = 666.

It is not a de Polignac number, because 397520255709 - 2²³ = 397511867101 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397520256709) 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, 279549399 + ... + 279550820.

It is an arithmetic number, because the mean of its divisors is an integer number (48455352400).

Almost surely, 2^397520255709 is an apocalyptic number.

It is an amenable number.

397520255709 is a deficient number, since it is larger than the sum of its proper divisors (183943973091).

397520255709 is a wasteful number, since it uses less digits than its factorization.

397520255709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559100304 (or 559100301 counting only the distinct ones).

The product of its (nonzero) digits is 5953500, while the sum is 54.

The spelling of 397520255709 in words is "three hundred ninety-seven billion, five hundred twenty million, two hundred fifty-five thousand, seven hundred nine".