321405985 has 16 divisors (see below), whose sum is σ = 411863040. Its totient is φ = 240246720.

The previous prime is 321405977. The next prime is 321405991. The reversal of 321405985 is 589504123.

It is not a de Polignac number, because 321405985 - 2³ = 321405977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31257 + ... + 40246.

It is an arithmetic number, because the mean of its divisors is an integer number (25741440).

Almost surely, 2^321405985 is an apocalyptic number.

It is an amenable number.

321405985 is a deficient number, since it is larger than the sum of its proper divisors (90457055).

321405985 is a wasteful number, since it uses less digits than its factorization.

321405985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71568.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 321405985 is about 17927.7992235522. The cubic root of 321405985 is about 684.9906653318.

The spelling of 321405985 in words is "three hundred twenty-one million, four hundred five thousand, nine hundred eighty-five".