405085985 has 8 divisors (see below), whose sum is σ = 511687680. Its totient is φ = 307012464.

The previous prime is 405085981. The next prime is 405085987. The reversal of 405085985 is 589580504.

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 405085985 - 2² = 405085981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405085981) 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, 2131937 + ... + 2132126.

It is an arithmetic number, because the mean of its divisors is an integer number (63960960).

Almost surely, 2^405085985 is an apocalyptic number.

It is an amenable number.

405085985 is a deficient number, since it is larger than the sum of its proper divisors (106601695).

405085985 is a wasteful number, since it uses less digits than its factorization.

405085985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264087.

The product of its (nonzero) digits is 288000, while the sum is 44.

The square root of 405085985 is about 20126.7479986211. The cubic root of 405085985 is about 739.9159784077.

The spelling of 405085985 in words is "four hundred five million, eighty-five thousand, nine hundred eighty-five".