404681439 has 8 divisors (see below), whose sum is σ = 552735792. Its totient is φ = 263207360.

The previous prime is 404681377. The next prime is 404681443. The reversal of 404681439 is 934186404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404681439 - 2¹¹ = 404679391 is a prime.

It is a super-2 number, since 2×404681439² = 327534134142221442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 404681397 and 404681406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404681479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1644924 + ... + 1645169.

It is an arithmetic number, because the mean of its divisors is an integer number (69091974).

Almost surely, 2^404681439 is an apocalyptic number.

404681439 is a deficient number, since it is larger than the sum of its proper divisors (148054353).

404681439 is a wasteful number, since it uses less digits than its factorization.

404681439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290137.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 404681439 is about 20116.6955288387. The cubic root of 404681439 is about 739.6695864815.

The spelling of 404681439 in words is "four hundred four million, six hundred eighty-one thousand, four hundred thirty-nine".