398977779893 has 8 divisors (see below), whose sum is σ = 497426842560. Its totient is φ = 310891776480.

The previous prime is 398977779859. The next prime is 398977779901.

398977779893 is nontrivially palindromic in base 10.

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 398977779893 - 2⁶ = 398977779829 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 (398977775893) 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, 2590764728 + ... + 2590764881.

It is an arithmetic number, because the mean of its divisors is an integer number (62178355320).

Almost surely, 2^398977779893 is an apocalyptic number.

It is an amenable number.

398977779893 is a deficient number, since it is larger than the sum of its proper divisors (98449062667).

398977779893 is a wasteful number, since it uses less digits than its factorization.

398977779893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181529627.

The product of its digits is 9073705536, while the sum is 86.

The spelling of 398977779893 in words is "three hundred ninety-eight billion, nine hundred seventy-seven million, seven hundred seventy-nine thousand, eight hundred ninety-three".