397897047 has 6 divisors (see below), whose sum is σ = 574740192. Its totient is φ = 265264692.

The previous prime is 397897043. The next prime is 397897057. The reversal of 397897047 is 740798793.

It is not a de Polignac number, because 397897047 - 2² = 397897043 is a prime.

It is a super-2 number, since 2×397897047² = 316644120022640418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 397896984 and 397897002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397897043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22105383 + ... + 22105400.

It is an arithmetic number, because the mean of its divisors is an integer number (95790032).

Almost surely, 2^397897047 is an apocalyptic number.

397897047 is a deficient number, since it is larger than the sum of its proper divisors (176843145).

397897047 is a wasteful number, since it uses less digits than its factorization.

397897047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44210789 (or 44210786 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The square root of 397897047 is about 19947.3568925810. The cubic root of 397897047 is about 735.5128060938.

It can be divided in two parts, 3978 and 97047, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 397897047 in words is "three hundred ninety-seven million, eight hundred ninety-seven thousand, forty-seven".