404963989 has 4 divisors (see below), whose sum is σ = 405302380. Its totient is φ = 404625600.

The previous prime is 404963969. The next prime is 404964029. The reversal of 404963989 is 989369404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5963364 + 399000625 = 2442^2 + 19975^2 .

It is a cyclic number.

It is not a de Polignac number, because 404963989 - 2⁵ = 404963957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404963969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167394 + ... + 169795.

It is an arithmetic number, because the mean of its divisors is an integer number (101325595).

Almost surely, 2^404963989 is an apocalyptic number.

It is an amenable number.

404963989 is a deficient number, since it is larger than the sum of its proper divisors (338391).

404963989 is a wasteful number, since it uses less digits than its factorization.

404963989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338390.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The square root of 404963989 is about 20123.7170771207. The cubic root of 404963989 is about 739.8416930657.

The spelling of 404963989 in words is "four hundred four million, nine hundred sixty-three thousand, nine hundred eighty-nine".