398655 has 16 divisors (see below), whose sum is σ = 708960. Its totient is φ = 212544.

The previous prime is 398627. The next prime is 398669. The reversal of 398655 is 556893.

It is not a de Polignac number, because 398655 - 2⁶ = 398591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (44310).

2³⁹⁸⁶⁵⁵ is an apocalyptic number.

398655 is a deficient number, since it is larger than the sum of its proper divisors (310305).

398655 is a wasteful number, since it uses less digits than its factorization.

398655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967 (or 2961 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 398655 is about 631.3913208146. The cubic root of 398655 is about 73.5979535308.

The spelling of 398655 in words is "three hundred ninety-eight thousand, six hundred fifty-five".