398945851 has 16 divisors (see below), whose sum is σ = 437177088. Its totient is φ = 362419200.

The previous prime is 398945839. The next prime is 398945863. The reversal of 398945851 is 158549893.

It is an interprime number because it is at equal distance from previous prime (398945839) and next prime (398945863).

It is a cyclic number.

It is not a de Polignac number, because 398945851 - 2⁵ = 398945819 is a prime.

It is a super-2 number, since 2×398945851² = 318315584060228402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398945801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273841 + ... + 275293.

It is an arithmetic number, because the mean of its divisors is an integer number (27323568).

Almost surely, 2^398945851 is an apocalyptic number.

398945851 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

398945851 is a deficient number, since it is larger than the sum of its proper divisors (38231237).

398945851 is a wasteful number, since it uses less digits than its factorization.

398945851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its digits is 1555200, while the sum is 52.

The square root of 398945851 is about 19973.6288891128. The cubic root of 398945851 is about 736.1584772898.

The spelling of 398945851 in words is "three hundred ninety-eight million, nine hundred forty-five thousand, eight hundred fifty-one".