398827360781 has 4 divisors (see below), whose sum is σ = 398829424512. Its totient is φ = 398825297052.

The previous prime is 398827360751. The next prime is 398827360787. The reversal of 398827360781 is 187063728893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398827360781 - 2⁶ = 398827360717 is a prime.

It is a super-2 number, since 2×398827360781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398827360787) 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, 708125 + ... + 1139778.

It is an arithmetic number, because the mean of its divisors is an integer number (99707356128).

Almost surely, 2^398827360781 is an apocalyptic number.

It is an amenable number.

398827360781 is a deficient number, since it is larger than the sum of its proper divisors (2063731).

398827360781 is a wasteful number, since it uses less digits than its factorization.

398827360781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063730.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 398827360781 in words is "three hundred ninety-eight billion, eight hundred twenty-seven million, three hundred sixty thousand, seven hundred eighty-one".