398878149761 has 8 divisors (see below), whose sum is σ = 490926953664. Its totient is φ = 315595898640.

The previous prime is 398878149757. The next prime is 398878149767. The reversal of 398878149761 is 167941878893.

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 398878149761 - 2² = 398878149757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398878149767) 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, 2191638095 + ... + 2191638276.

It is an arithmetic number, because the mean of its divisors is an integer number (61365869208).

Almost surely, 2^398878149761 is an apocalyptic number.

It is an amenable number.

398878149761 is a deficient number, since it is larger than the sum of its proper divisors (92048803903).

398878149761 is a wasteful number, since it uses less digits than its factorization.

398878149761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4383276391.

The product of its digits is 146313216, while the sum is 71.

The spelling of 398878149761 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, one hundred forty-nine thousand, seven hundred sixty-one".