398831381511 has 16 divisors (see below), whose sum is σ = 563529627360. Its totient is φ = 250457607680.

The previous prime is 398831381503. The next prime is 398831381521. The reversal of 398831381511 is 115183138893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 398831381511 - 2³ = 398831381503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398831381521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55902150 + ... + 55909283.

It is an arithmetic number, because the mean of its divisors is an integer number (35220601710).

Almost surely, 2^398831381511 is an apocalyptic number.

398831381511 is a deficient number, since it is larger than the sum of its proper divisors (164698245849).

398831381511 is a wasteful number, since it uses less digits than its factorization.

398831381511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111811506.

The product of its digits is 622080, while the sum is 51.

The spelling of 398831381511 in words is "three hundred ninety-eight billion, eight hundred thirty-one million, three hundred eighty-one thousand, five hundred eleven".