321424740 has 384 divisors, whose sum is σ = 1276477440. Its totient is φ = 65318400.

The previous prime is 321424717. The next prime is 321424757. The reversal of 321424740 is 47424123.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1523235 + ... + 1523445.

It is an arithmetic number, because the mean of its divisors is an integer number (3324160).

Almost surely, 2^321424740 is an apocalyptic number.

321424740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321424740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638238720).

321424740 is an abundant number, since it is smaller than the sum of its proper divisors (955052700).

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

321424740 is a wasteful number, since it uses less digits than its factorization.

321424740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 321424740 is about 17928.3222862598. The cubic root of 321424740 is about 685.0039888236.

Adding to 321424740 its reverse (47424123), we get a palindrome (368848863).

The spelling of 321424740 in words is "three hundred twenty-one million, four hundred twenty-four thousand, seven hundred forty".