398520025892 has 6 divisors (see below), whose sum is σ = 697410045318. Its totient is φ = 199260012944.

The previous prime is 398520025879. The next prime is 398520025913. The reversal of 398520025892 is 298520025893.

It can be written as a sum of positive squares in only one way, i.e., 219376077376 + 179143948516 = 468376^2 + 423254^2 .

It is a super-2 number, since 2×398520025892² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49815003233 + ... + 49815003240.

It is an arithmetic number, because the mean of its divisors is an integer number (116235007553).

Almost surely, 2^398520025892 is an apocalyptic number.

It is an amenable number.

398520025892 is a deficient number, since it is larger than the sum of its proper divisors (298890019426).

398520025892 is a wasteful number, since it uses less digits than its factorization.

398520025892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99630006477 (or 99630006475 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

Subtracting from 398520025892 its reverse (298520025893), we obtain a palindrome (99999999999).

The spelling of 398520025892 in words is "three hundred ninety-eight billion, five hundred twenty million, twenty-five thousand, eight hundred ninety-two".