321696138 has 16 divisors (see below), whose sum is σ = 647654976. Its totient is φ = 106521600.

The previous prime is 321696121. The next prime is 321696149. The reversal of 321696138 is 831696123.

It is a junction number, because it is equal to n+sod(n) for n = 321696096 and 321696105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176631 + ... + 178442.

It is an arithmetic number, because the mean of its divisors is an integer number (40478436).

Almost surely, 2^321696138 is an apocalyptic number.

321696138 is an abundant number, since it is smaller than the sum of its proper divisors (325958838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321696138 is a wasteful number, since it uses less digits than its factorization.

321696138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355229.

The product of its digits is 46656, while the sum is 39.

The square root of 321696138 is about 17935.8896629077. The cubic root of 321696138 is about 685.1967311045.

The spelling of 321696138 in words is "three hundred twenty-one million, six hundred ninety-six thousand, one hundred thirty-eight".