321456987 has 12 divisors (see below), whose sum is σ = 464549904. Its totient is φ = 214201680.

The previous prime is 321456943. The next prime is 321457001. The reversal of 321456987 is 789654123.

321456987 is a `hidden beast` number, since 3 + 2 + 1 + 4 + 569 + 87 = 666.

It is not a de Polignac number, because 321456987 - 2⁸ = 321456731 is a prime.

It is a super-2 number, since 2×321456987² = 206669188982236338, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (321456907) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14437 + ... + 29177.

It is an arithmetic number, because the mean of its divisors is an integer number (38712492).

Almost surely, 2^321456987 is an apocalyptic number.

321456987 is a deficient number, since it is larger than the sum of its proper divisors (143092917).

321456987 is a wasteful number, since it uses less digits than its factorization.

321456987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17170 (or 17167 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 321456987 is about 17929.2215949271. The cubic root of 321456987 is about 685.0268957774.

The spelling of 321456987 in words is "three hundred twenty-one million, four hundred fifty-six thousand, nine hundred eighty-seven".