404897791 has 4 divisors (see below), whose sum is σ = 406026000. Its totient is φ = 403769584.

The previous prime is 404897767. The next prime is 404897803. The reversal of 404897791 is 197798404.

404897791 is nontrivially palindromic in base 5.

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 404897791 - 2¹⁵ = 404865023 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404897711) 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, 563566 + ... + 564283.

It is an arithmetic number, because the mean of its divisors is an integer number (101506500).

Almost surely, 2^404897791 is an apocalyptic number.

404897791 is a deficient number, since it is larger than the sum of its proper divisors (1128209).

404897791 is a wasteful number, since it uses less digits than its factorization.

404897791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128208.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 404897791 is about 20122.0722342407. The cubic root of 404897791 is about 739.8013777862.

The spelling of 404897791 in words is "four hundred four million, eight hundred ninety-seven thousand, seven hundred ninety-one".