404491539 has 4 divisors (see below), whose sum is σ = 539322056. Its totient is φ = 269661024.

The previous prime is 404491537. The next prime is 404491543. The reversal of 404491539 is 935194404.

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

It is not a de Polignac number, because 404491539 - 2¹ = 404491537 is a prime.

It is a super-2 number, since 2×404491539² = 327226810245177042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404491497 and 404491506.

It is not an unprimeable number, because it can be changed into a prime (404491531) 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, 67415254 + ... + 67415259.

It is an arithmetic number, because the mean of its divisors is an integer number (134830514).

Almost surely, 2^404491539 is an apocalyptic number.

404491539 is a deficient number, since it is larger than the sum of its proper divisors (134830517).

404491539 is a wasteful number, since it uses less digits than its factorization.

404491539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134830516.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 404491539 is about 20111.9750149009. The cubic root of 404491539 is about 739.5538697573.

The spelling of 404491539 in words is "four hundred four million, four hundred ninety-one thousand, five hundred thirty-nine".