398775 has 24 divisors (see below), whose sum is σ = 711760. Its totient is φ = 195840.

The previous prime is 398771. The next prime is 398813. The reversal of 398775 is 577893.

398775 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 398775 - 2² = 398771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

398775 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398771) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 771 + ... + 1179.

2³⁹⁸⁷⁷⁵ is an apocalyptic number.

398775 is a deficient number, since it is larger than the sum of its proper divisors (312985).

398775 is a wasteful number, since it uses less digits than its factorization.

398775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 430 counting only the distinct ones).

The product of its digits is 52920, while the sum is 39.

The square root of 398775 is about 631.4863418951. The cubic root of 398775 is about 73.6053374162.

It can be divided in two parts, 39 and 8775, that multiplied together give a square (342225 = 585²).

The spelling of 398775 in words is "three hundred ninety-eight thousand, seven hundred seventy-five".