397855647 has 36 divisors (see below), whose sum is σ = 672053200. Its totient is φ = 226712808.

The previous prime is 397855637. The next prime is 397855657. The reversal of 397855647 is 746558793.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

397855647 is a `hidden beast` number, since 3 + 9 + 78 + 5 + 564 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (397855637) and next prime (397855657).

It is not a de Polignac number, because 397855647 - 2¹⁴ = 397839263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397855593 and 397855602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397855637) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1108054 + ... + 1108412.

Almost surely, 2^397855647 is an apocalyptic number.

397855647 is a deficient number, since it is larger than the sum of its proper divisors (274197553).

397855647 is an frugal number, since it uses more digits than its factorization.

397855647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 369 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The square root of 397855647 is about 19946.3191341159. The cubic root of 397855647 is about 735.4872959051.

The spelling of 397855647 in words is "three hundred ninety-seven million, eight hundred fifty-five thousand, six hundred forty-seven".