321139640 has 16 divisors (see below), whose sum is σ = 722564280. Its totient is φ = 128455840.

The previous prime is 321139631. The next prime is 321139669. The reversal of 321139640 is 46931123.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4014206 + ... + 4014285.

Almost surely, 2^321139640 is an apocalyptic number.

It is an amenable number.

321139640 is an abundant number, since it is smaller than the sum of its proper divisors (401424640).

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

321139640 is a wasteful number, since it uses less digits than its factorization.

321139640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8028502 (or 8028498 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 321139640 is about 17920.3694158352. The cubic root of 321139640 is about 684.8013987274.

The spelling of 321139640 in words is "three hundred twenty-one million, one hundred thirty-nine thousand, six hundred forty".