397851 has 16 divisors (see below), whose sum is σ = 583200. Its totient is φ = 240128.

The previous prime is 397849. The next prime is 397867. The reversal of 397851 is 158793.

It is a cyclic number.

It is not a de Polignac number, because 397851 - 2¹ = 397849 is a prime.

397851 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 397851.

It is not an unprimeable number, because it can be changed into a prime (397811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (36450).

2³⁹⁷⁸⁵¹ is an apocalyptic number.

397851 is a deficient number, since it is larger than the sum of its proper divisors (185349).

397851 is a wasteful number, since it uses less digits than its factorization.

397851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318.

The product of its digits is 7560, while the sum is 33.

The square root of 397851 is about 630.7543103301. The cubic root of 397851 is about 73.5484432368.

The spelling of 397851 in words is "three hundred ninety-seven thousand, eight hundred fifty-one".