397887 has 8 divisors (see below), whose sum is σ = 606336. Its totient is φ = 227352.

The previous prime is 397867. The next prime is 397897. The reversal of 397887 is 788793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397887 - 2⁷ = 397759 is a prime.

397887 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397887.

It is not an unprimeable number, because it can be changed into a prime (397807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9453 + ... + 9494.

It is an arithmetic number, because the mean of its divisors is an integer number (75792).

2³⁹⁷⁸⁸⁷ is an apocalyptic number.

397887 is a deficient number, since it is larger than the sum of its proper divisors (208449).

397887 is a wasteful number, since it uses less digits than its factorization.

397887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18957.

The product of its digits is 84672, while the sum is 42.

The square root of 397887 is about 630.7828469450. The cubic root of 397887 is about 73.5506615414.

The spelling of 397887 in words is "three hundred ninety-seven thousand, eight hundred eighty-seven".