404137385 has 4 divisors (see below), whose sum is σ = 484964868. Its totient is φ = 323309904.

The previous prime is 404137339. The next prime is 404137403. The reversal of 404137385 is 583731404.

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 190743721 + 213393664 = 13811^2 + 14608^2 .

It is a cyclic number.

It is not a de Polignac number, because 404137385 - 2¹⁰ = 404136361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40413734 + ... + 40413743.

It is an arithmetic number, because the mean of its divisors is an integer number (121241217).

Almost surely, 2^404137385 is an apocalyptic number.

It is an amenable number.

404137385 is a deficient number, since it is larger than the sum of its proper divisors (80827483).

404137385 is an equidigital number, since it uses as much as digits as its factorization.

404137385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80827482.

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

The square root of 404137385 is about 20103.1685313535. The cubic root of 404137385 is about 739.3379670633.

Adding to 404137385 its reverse (583731404), we get a palindrome (987868789).

The spelling of 404137385 in words is "four hundred four million, one hundred thirty-seven thousand, three hundred eighty-five".