404603681 has 2 divisors, whose sum is σ = 404603682. Its totient is φ = 404603680.

The previous prime is 404603629. The next prime is 404603747. The reversal of 404603681 is 186306404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400360081 + 4243600 = 20009^2 + 2060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404603681 is a prime.

It is a super-2 number, since 2×404603681² = 327408277357499522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (404603611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202301840 + 202301841.

It is an arithmetic number, because the mean of its divisors is an integer number (202301841).

Almost surely, 2^404603681 is an apocalyptic number.

It is an amenable number.

404603681 is a deficient number, since it is larger than the sum of its proper divisors (1).

404603681 is an equidigital number, since it uses as much as digits as its factorization.

404603681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 404603681 is about 20114.7627627074. The cubic root of 404603681 is about 739.6222085472.

The spelling of 404603681 in words is "four hundred four million, six hundred three thousand, six hundred eighty-one".