398336687 has 4 divisors (see below), whose sum is σ = 455241936. Its totient is φ = 341431440.

The previous prime is 398336683. The next prime is 398336693. The reversal of 398336687 is 786633893.

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

It is not a de Polignac number, because 398336687 - 2² = 398336683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398336683) 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, 28452614 + ... + 28452627.

It is an arithmetic number, because the mean of its divisors is an integer number (113810484).

Almost surely, 2^398336687 is an apocalyptic number.

398336687 is a deficient number, since it is larger than the sum of its proper divisors (56905249).

398336687 is an equidigital number, since it uses as much as digits as its factorization.

398336687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56905248.

The product of its digits is 3919104, while the sum is 53.

The square root of 398336687 is about 19958.3738566047. The cubic root of 398336687 is about 735.7835979404.

The spelling of 398336687 in words is "three hundred ninety-eight million, three hundred thirty-six thousand, six hundred eighty-seven".