398639913 has 8 divisors (see below), whose sum is σ = 607451328. Its totient is φ = 227794224.

The previous prime is 398639911. The next prime is 398639951. The reversal of 398639913 is 319936893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398639913 - 2¹ = 398639911 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398639911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9491406 + ... + 9491447.

It is an arithmetic number, because the mean of its divisors is an integer number (75931416).

Almost surely, 2^398639913 is an apocalyptic number.

It is an amenable number.

398639913 is a deficient number, since it is larger than the sum of its proper divisors (208811415).

398639913 is a wasteful number, since it uses less digits than its factorization.

398639913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18982863.

The product of its digits is 944784, while the sum is 51.

The square root of 398639913 is about 19965.9688720583. The cubic root of 398639913 is about 735.9702508701.

The spelling of 398639913 in words is "three hundred ninety-eight million, six hundred thirty-nine thousand, nine hundred thirteen".