403344661 has 4 divisors (see below), whose sum is σ = 403761024. Its totient is φ = 402928300.

The previous prime is 403344653. The next prime is 403344671. The reversal of 403344661 is 166443304.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 403344661 - 2³ = 403344653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403344671) 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, 206725 + ... + 208666.

It is an arithmetic number, because the mean of its divisors is an integer number (100940256).

Almost surely, 2^403344661 is an apocalyptic number.

It is an amenable number.

403344661 is a deficient number, since it is larger than the sum of its proper divisors (416363).

403344661 is an equidigital number, since it uses as much as digits as its factorization.

403344661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416362.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 403344661 is about 20083.4424589013. The cubic root of 403344661 is about 738.8542416435.

Adding to 403344661 its reverse (166443304), we get a palindrome (569787965).

The spelling of 403344661 in words is "four hundred three million, three hundred forty-four thousand, six hundred sixty-one".