406665761 has 8 divisors (see below), whose sum is σ = 416047104. Its totient is φ = 397314880.

The previous prime is 406665739. The next prime is 406665793. The reversal of 406665761 is 167566604.

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 406665761 - 2⁶ = 406665697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406664761) 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 7 ways as a sum of consecutive naturals, for example, 20576 + ... + 35166.

It is an arithmetic number, because the mean of its divisors is an integer number (52005888).

Almost surely, 2^406665761 is an apocalyptic number.

It is an amenable number.

406665761 is a deficient number, since it is larger than the sum of its proper divisors (9381343).

406665761 is a wasteful number, since it uses less digits than its factorization.

406665761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15231.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 406665761 is about 20165.9554943474. The cubic root of 406665761 is about 740.8765853872.

The spelling of 406665761 in words is "four hundred six million, six hundred sixty-five thousand, seven hundred sixty-one".