398755 has 8 divisors (see below), whose sum is σ = 546912. Its totient is φ = 273408.

The previous prime is 398731. The next prime is 398759. The reversal of 398755 is 557893.

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

It is a cyclic number.

It is not a de Polignac number, because 398755 - 2⁷ = 398627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398759) 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, 5662 + ... + 5731.

It is an arithmetic number, because the mean of its divisors is an integer number (68364).

2³⁹⁸⁷⁵⁵ is an apocalyptic number.

398755 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

398755 is a deficient number, since it is larger than the sum of its proper divisors (148157).

398755 is a wasteful number, since it uses less digits than its factorization.

398755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11405.

The product of its digits is 37800, while the sum is 37.

The square root of 398755 is about 631.4705060413. The cubic root of 398755 is about 73.6041068715.

The spelling of 398755 in words is "three hundred ninety-eight thousand, seven hundred fifty-five".