404049989 has 4 divisors (see below), whose sum is σ = 461771424. Its totient is φ = 346328556.

The previous prime is 404049979. The next prime is 404050013. The reversal of 404049989 is 989940404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 404049989 - 2¹⁶ = 403984453 is a prime.

It is a super-2 number, since 2×404049989² = 326512787221800242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404049949) 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, 28860707 + ... + 28860720.

It is an arithmetic number, because the mean of its divisors is an integer number (115442856).

Almost surely, 2^404049989 is an apocalyptic number.

It is an amenable number.

404049989 is a deficient number, since it is larger than the sum of its proper divisors (57721435).

404049989 is an equidigital number, since it uses as much as digits as its factorization.

404049989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57721434.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 404049989 is about 20100.9947266298. The cubic root of 404049989 is about 739.2846684891.

The spelling of 404049989 in words is "four hundred four million, forty-nine thousand, nine hundred eighty-nine".