321423390 has 160 divisors (see below), whose sum is σ = 918314496. Its totient is φ = 80831520.

The previous prime is 321423383. The next prime is 321423391. The reversal of 321423390 is 93324123.

It is a happy number.

321423390 is a `hidden beast` number, since 321 + 4 + 2 + 339 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321423391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4527055 + ... + 4527125.

Almost surely, 2^321423390 is an apocalyptic number.

321423390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 321423390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459157248).

321423390 is an abundant number, since it is smaller than the sum of its proper divisors (596891106).

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

321423390 is an frugal number, since it uses more digits than its factorization.

321423390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 321423390 is about 17928.2846362947. The cubic root of 321423390 is about 685.0030298053.

The spelling of 321423390 in words is "three hundred twenty-one million, four hundred twenty-three thousand, three hundred ninety".