321606387 has 6 divisors (see below), whose sum is σ = 464542572. Its totient is φ = 214404252.

The previous prime is 321606361. The next prime is 321606403. The reversal of 321606387 is 783606123.

It is a happy number.

321606387 is a `hidden beast` number, since 3 + 2 + 16 + 0 + 638 + 7 = 666.

It is not a de Polignac number, because 321606387 - 2¹² = 321602291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321606347) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17867013 + ... + 17867030.

It is an arithmetic number, because the mean of its divisors is an integer number (77423762).

Almost surely, 2^321606387 is an apocalyptic number.

321606387 is a deficient number, since it is larger than the sum of its proper divisors (142936185).

321606387 is a wasteful number, since it uses less digits than its factorization.

321606387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35734049 (or 35734046 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 321606387 is about 17933.3874937224. The cubic root of 321606387 is about 685.1330034595.

The spelling of 321606387 in words is "three hundred twenty-one million, six hundred six thousand, three hundred eighty-seven".