320440340 has 24 divisors (see below), whose sum is σ = 734100192. Its totient is φ = 116523680.

The previous prime is 320440319. The next prime is 320440391. The reversal of 320440340 is 43044023.

It is a happy number.

It is a super-2 number, since 2×320440340² = 205364022998631200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728054 + ... + 728493.

It is an arithmetic number, because the mean of its divisors is an integer number (30587508).

Almost surely, 2^320440340 is an apocalyptic number.

It is an amenable number.

320440340 is an abundant number, since it is smaller than the sum of its proper divisors (413659852).

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

320440340 is a wasteful number, since it uses less digits than its factorization.

320440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456567 (or 1456565 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 320440340 is about 17900.8474659721. The cubic root of 320440340 is about 684.3039727098.

Adding to 320440340 its reverse (43044023), we get a palindrome (363484363).

The spelling of 320440340 in words is "three hundred twenty million, four hundred forty thousand, three hundred forty".