398740869 has 12 divisors (see below), whose sum is σ = 579494656. Its totient is φ = 264195432.

The previous prime is 398740861. The next prime is 398740871. The reversal of 398740869 is 968047893.

It is not a de Polignac number, because 398740869 - 2³ = 398740861 is a prime.

It is a super-2 number, since 2×398740869² = 317988561221750322, 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 (398740861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134437 + ... + 137370.

Almost surely, 2^398740869 is an apocalyptic number.

It is an amenable number.

398740869 is a deficient number, since it is larger than the sum of its proper divisors (180753787).

398740869 is a wasteful number, since it uses less digits than its factorization.

398740869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271976 (or 271973 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 398740869 is about 19968.4969138891. The cubic root of 398740869 is about 736.0323740535.

The spelling of 398740869 in words is "three hundred ninety-eight million, seven hundred forty thousand, eight hundred sixty-nine".