404812991 has 4 divisors (see below), whose sum is σ = 441614184. Its totient is φ = 368011800.

The previous prime is 404812981. The next prime is 404813011. The reversal of 404812991 is 199218404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404812991 - 2¹⁸ = 404550847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404812921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18400580 + ... + 18400601.

It is an arithmetic number, because the mean of its divisors is an integer number (110403546).

Almost surely, 2^404812991 is an apocalyptic number.

404812991 is a deficient number, since it is larger than the sum of its proper divisors (36801193).

404812991 is a wasteful number, since it uses less digits than its factorization.

404812991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36801192.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 404812991 is about 20119.9649850590. The cubic root of 404812991 is about 739.7497272722.

The spelling of 404812991 in words is "four hundred four million, eight hundred twelve thousand, nine hundred ninety-one".