398393801972 has 24 divisors (see below), whose sum is σ = 702342042696. Its totient is φ = 197724912128.

The previous prime is 398393801963. The next prime is 398393802049. The reversal of 398393801972 is 279108393893.

It can be written as a sum of positive squares in 4 ways, for example, as 65007661156 + 333386140816 = 254966^2 + 577396^2 .

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, 7598198 + ... + 7650450.

It is an arithmetic number, because the mean of its divisors is an integer number (29264251779).

Almost surely, 2^398393801972 is an apocalyptic number.

It is an amenable number.

398393801972 is a deficient number, since it is larger than the sum of its proper divisors (303948240724).

398393801972 is a wasteful number, since it uses less digits than its factorization.

398393801972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66307 (or 66305 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 62.

The spelling of 398393801972 in words is "three hundred ninety-eight billion, three hundred ninety-three million, eight hundred one thousand, nine hundred seventy-two".