398899285 has 4 divisors (see below), whose sum is σ = 478679148. Its totient is φ = 319119424.

The previous prime is 398899279. The next prime is 398899301. The reversal of 398899285 is 582998893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 218507524 + 180391761 = 14782^2 + 13431^2 .

It is a cyclic number.

It is not a de Polignac number, because 398899285 - 2¹⁷ = 398768213 is a prime.

It is a super-2 number, since 2×398899285² = 318241279147022450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39889924 + ... + 39889933.

It is an arithmetic number, because the mean of its divisors is an integer number (119669787).

Almost surely, 2^398899285 is an apocalyptic number.

It is an amenable number.

398899285 is a deficient number, since it is larger than the sum of its proper divisors (79779863).

398899285 is an equidigital number, since it uses as much as digits as its factorization.

398899285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79779862.

The product of its digits is 11197440, while the sum is 61.

The square root of 398899285 is about 19972.4631680722. The cubic root of 398899285 is about 736.1298340630.

The spelling of 398899285 in words is "three hundred ninety-eight million, eight hundred ninety-nine thousand, two hundred eighty-five".