398826388540 has 24 divisors (see below), whose sum is σ = 838446809760. Its totient is φ = 159356956608.

The previous prime is 398826388483. The next prime is 398826388559. The reversal of 398826388540 is 45883628893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10831087 + ... + 10867846.

It is an arithmetic number, because the mean of its divisors is an integer number (34935283740).

Almost surely, 2^398826388540 is an apocalyptic number.

It is an amenable number.

398826388540 is an abundant number, since it is smaller than the sum of its proper divisors (439620421220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398826388540 is a wasteful number, since it uses less digits than its factorization.

398826388540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21699861 (or 21699859 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 64.

The spelling of 398826388540 in words is "three hundred ninety-eight billion, eight hundred twenty-six million, three hundred eighty-eight thousand, five hundred forty".