398378983 has 4 divisors (see below), whose sum is σ = 404909848. Its totient is φ = 391848120.

The previous prime is 398378951. The next prime is 398378989. The reversal of 398378983 is 389873893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398378983 - 2⁵ = 398378951 is a prime.

It is a super-2 number, since 2×398378983² = 317411628192228578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398378989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3265341 + ... + 3265462.

It is an arithmetic number, because the mean of its divisors is an integer number (101227462).

Almost surely, 2^398378983 is an apocalyptic number.

398378983 is a deficient number, since it is larger than the sum of its proper divisors (6530865).

398378983 is an equidigital number, since it uses as much as digits as its factorization.

398378983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530864.

The product of its digits is 7838208, while the sum is 58.

The square root of 398378983 is about 19959.4334338428. The cubic root of 398378983 is about 735.8096392288.

The spelling of 398378983 in words is "three hundred ninety-eight million, three hundred seventy-eight thousand, nine hundred eighty-three".