398445273676836 has 81 divisors (see below), whose sum is σ = 1069917578971059. Its totient is φ = 125001800045568.

The previous prime is 398445273676823. The next prime is 398445273677021. The reversal of 398445273676836 is 638676372544893.

The square root of 398445273676836 is 19961094.

It is a perfect power (a square), and thus also a powerful number.

398445273676836 is a `hidden beast` number, since 3 + 9 + 8 + 4 + 4 + 527 + 3 + 6 + 7 + 6 + 83 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3052728806436 + 395392544870400 = 1747206^2 + 19884480^2 .

It is a super-2 number, since 2×398445273676836² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2035933740 + ... + 2036129436.

Almost surely, 2^{398445273676836} is an apocalyptic number.

398445273676836 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

398445273676836 is the 19961094-th square number.

It is an amenable number.

398445273676836 is an abundant number, since it is smaller than the sum of its proper divisors (671472305294223).

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

398445273676836 is an frugal number, since it uses more digits than its factorization.

398445273676836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391438 (or 195719 counting only the distinct ones).

The product of its digits is 26336378880, while the sum is 81.

The spelling of 398445273676836 in words is "three hundred ninety-eight trillion, four hundred forty-five billion, two hundred seventy-three million, six hundred seventy-six thousand, eight hundred thirty-six".