398930017877 has 4 divisors (see below), whose sum is σ = 412686225420. Its totient is φ = 385173810336.

The previous prime is 398930017873. The next prime is 398930017891. The reversal of 398930017877 is 778710039893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 299297620561 + 99632397316 = 547081^2 + 315646^2 .

It is a cyclic number.

It is not a de Polignac number, because 398930017877 - 2² = 398930017873 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 (398930017873) 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, 6878103728 + ... + 6878103785.

It is an arithmetic number, because the mean of its divisors is an integer number (103171556355).

Almost surely, 2^398930017877 is an apocalyptic number.

It is an amenable number.

398930017877 is a deficient number, since it is larger than the sum of its proper divisors (13756207543).

398930017877 is a wasteful number, since it uses less digits than its factorization.

398930017877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13756207542.

The product of its (nonzero) digits is 16003008, while the sum is 62.

The spelling of 398930017877 in words is "three hundred ninety-eight billion, nine hundred thirty million, seventeen thousand, eight hundred seventy-seven".