401992772841 has 27 divisors (see below), whose sum is σ = 638275190007. Its totient is φ = 243619302960.

The previous prime is 401992772833. The next prime is 401992772861. The reversal of 401992772841 is 148277299104.

The square root of 401992772841 is 634029.

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

401992772841 is a `hidden beast` number, since 4 + 0 + 1 + 99 + 277 + 284 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 387973265625 + 14019507216 = 622875^2 + 118404^2 .

It is not a de Polignac number, because 401992772841 - 2³ = 401992772833 is a prime.

It is a super-2 number, since 2×401992772841² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401992772801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20913351 + ... + 20932563.

Almost surely, 2^401992772841 is an apocalyptic number.

401992772841 is the 634029-th square number.

401992772841 is the 317015-th centered octagonal number.

It is an amenable number.

401992772841 is a deficient number, since it is larger than the sum of its proper divisors (236282417166).

401992772841 is an frugal number, since it uses more digits than its factorization.

401992772841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38454 (or 19227 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 401992772841 in words is "four hundred one billion, nine hundred ninety-two million, seven hundred seventy-two thousand, eight hundred forty-one".