405912661 has 16 divisors (see below), whose sum is σ = 507980160. Its totient is φ = 315103680.

The previous prime is 405912659. The next prime is 405912673. The reversal of 405912661 is 166219504.

It is a cyclic number.

It is not a de Polignac number, because 405912661 - 2¹ = 405912659 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 (405912691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10915 + ... + 30511.

It is an arithmetic number, because the mean of its divisors is an integer number (31748760).

Almost surely, 2^405912661 is an apocalyptic number.

It is an amenable number.

405912661 is a deficient number, since it is larger than the sum of its proper divisors (102067499).

405912661 is a wasteful number, since it uses less digits than its factorization.

405912661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19884.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 405912661 is about 20147.2742821455. The cubic root of 405912661 is about 740.4189622907.

The spelling of 405912661 in words is "four hundred five million, nine hundred twelve thousand, six hundred sixty-one".