404010661 has 32 divisors (see below), whose sum is σ = 464486400. Its totient is φ = 349090560.

The previous prime is 404010641. The next prime is 404010667. The reversal of 404010661 is 166010404.

It is a cyclic number.

It is not a de Polignac number, because 404010661 - 2¹¹ = 404008613 is a prime.

It is a super-2 number, since 2×404010661² = 326449228403313842, 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 (404010667) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1811596 + ... + 1811818.

It is an arithmetic number, because the mean of its divisors is an integer number (14515200).

Almost surely, 2^404010661 is an apocalyptic number.

It is an amenable number.

404010661 is a deficient number, since it is larger than the sum of its proper divisors (60475739).

404010661 is a wasteful number, since it uses less digits than its factorization.

404010661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 404010661 is about 20100.0164427793. The cubic root of 404010661 is about 739.2606817452.

The spelling of 404010661 in words is "four hundred four million, ten thousand, six hundred sixty-one".