404550861 has 16 divisors (see below), whose sum is σ = 633702720. Its totient is φ = 226321920.

The previous prime is 404550857. The next prime is 404550893. The reversal of 404550861 is 168055404.

It is not a de Polignac number, because 404550861 - 2² = 404550857 is a prime.

It is a super-2 number, since 2×404550861² = 327322798271682642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404550851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471076 + ... + 471933.

It is an arithmetic number, because the mean of its divisors is an integer number (39606420).

Almost surely, 2^404550861 is an apocalyptic number.

It is an amenable number.

404550861 is a deficient number, since it is larger than the sum of its proper divisors (229151859).

404550861 is a wasteful number, since it uses less digits than its factorization.

404550861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943036.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 404550861 is about 20113.4497538339. The cubic root of 404550861 is about 739.5900218692.

The spelling of 404550861 in words is "four hundred four million, five hundred fifty thousand, eight hundred sixty-one".