398731899 has 8 divisors (see below), whose sum is σ = 531819072. Its totient is φ = 265733000.

The previous prime is 398731873. The next prime is 398731903. The reversal of 398731899 is 998137893.

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

It is a cyclic number.

It is not a de Polignac number, because 398731899 - 2⁹ = 398731387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398731829) 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, 10689 + ... + 30194.

It is an arithmetic number, because the mean of its divisors is an integer number (66477384).

Almost surely, 2^398731899 is an apocalyptic number.

398731899 is a deficient number, since it is larger than the sum of its proper divisors (133087173).

398731899 is a wasteful number, since it uses less digits than its factorization.

398731899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44137.

The product of its digits is 2939328, while the sum is 57.

The square root of 398731899 is about 19968.2723088403. The cubic root of 398731899 is about 736.0268547965.

The spelling of 398731899 in words is "three hundred ninety-eight million, seven hundred thirty-one thousand, eight hundred ninety-nine".