397887471 has 32 divisors (see below), whose sum is σ = 610762240. Its totient is φ = 259028280.

The previous prime is 397887467. The next prime is 397887541. The reversal of 397887471 is 174788793.

397887471 is a `hidden beast` number, since 3 + 97 + 8 + 87 + 471 = 666.

It is not a de Polignac number, because 397887471 - 2² = 397887467 is a prime.

It is a super-3 number, since 3×397887471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397887461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91926 + ... + 96156.

It is an arithmetic number, because the mean of its divisors is an integer number (19086320).

Almost surely, 2^397887471 is an apocalyptic number.

397887471 is a deficient number, since it is larger than the sum of its proper divisors (212874769).

397887471 is an frugal number, since it uses more digits than its factorization.

397887471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295 (or 4277 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 397887471 is about 19947.1168593358. The cubic root of 397887471 is about 735.5069056336.

The spelling of 397887471 in words is "three hundred ninety-seven million, eight hundred eighty-seven thousand, four hundred seventy-one".