404427509 has 4 divisors (see below), whose sum is σ = 404476800. Its totient is φ = 404378220.

The previous prime is 404427503. The next prime is 404427539. The reversal of 404427509 is 905724404.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 404427509 - 2⁴ = 404427493 is a prime.

It is a super-2 number, since 2×404427509² = 327123220071890162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404427503) 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, 9047 + ... + 29844.

It is an arithmetic number, because the mean of its divisors is an integer number (101119200).

Almost surely, 2^404427509 is an apocalyptic number.

It is an amenable number.

404427509 is a deficient number, since it is larger than the sum of its proper divisors (49291).

404427509 is a wasteful number, since it uses less digits than its factorization.

404427509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49290.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 404427509 is about 20110.3831142025. The cubic root of 404427509 is about 739.5148445214.

The spelling of 404427509 in words is "four hundred four million, four hundred twenty-seven thousand, five hundred nine".