398188799 has 4 divisors (see below), whose sum is σ = 399298320. Its totient is φ = 397079280.

The previous prime is 398188787. The next prime is 398188801. The reversal of 398188799 is 997881893.

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

It is a cyclic number.

It is not a de Polignac number, because 398188799 - 2²⁸ = 129753343 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 (398188199) 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, 554222 + ... + 554939.

It is an arithmetic number, because the mean of its divisors is an integer number (99824580).

Almost surely, 2^398188799 is an apocalyptic number.

398188799 is a deficient number, since it is larger than the sum of its proper divisors (1109521).

398188799 is a wasteful number, since it uses less digits than its factorization.

398188799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109520.

The product of its digits is 7838208, while the sum is 62.

The square root of 398188799 is about 19954.6686016080. The cubic root of 398188799 is about 735.6925300597.

The spelling of 398188799 in words is "three hundred ninety-eight million, one hundred eighty-eight thousand, seven hundred ninety-nine".