321671920 has 40 divisors (see below), whose sum is σ = 749036880. Its totient is φ = 128471040.

The previous prime is 321671897. The next prime is 321671921. The reversal of 321671920 is 29176123.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321671921) by changing a digit.

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, 56400 + ... + 61840.

It is an arithmetic number, because the mean of its divisors is an integer number (18725922).

Almost surely, 2^321671920 is an apocalyptic number.

It is an amenable number.

321671920 is an abundant number, since it is smaller than the sum of its proper divisors (427364960).

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

321671920 is a wasteful number, since it uses less digits than its factorization.

321671920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6193 (or 6187 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 321671920 is about 17935.2145233895. The cubic root of 321671920 is about 685.1795362955.

The spelling of 321671920 in words is "three hundred twenty-one million, six hundred seventy-one thousand, nine hundred twenty".