405436661 has 8 divisors (see below), whose sum is σ = 466425984. Its totient is φ = 345214800.

The previous prime is 405436651. The next prime is 405436667. The reversal of 405436661 is 166634504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 405436661 - 2⁶ = 405436597 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 (405436667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190730 + ... + 192843.

It is an arithmetic number, because the mean of its divisors is an integer number (58303248).

Almost surely, 2^405436661 is an apocalyptic number.

It is an amenable number.

405436661 is a deficient number, since it is larger than the sum of its proper divisors (60989323).

405436661 is a wasteful number, since it uses less digits than its factorization.

405436661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383731.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 405436661 is about 20135.4578045795. The cubic root of 405436661 is about 740.1294276902.

The spelling of 405436661 in words is "four hundred five million, four hundred thirty-six thousand, six hundred sixty-one".