320401240 has 16 divisors (see below), whose sum is σ = 720902880. Its totient is φ = 128160480.

The previous prime is 320401231. The next prime is 320401243. The reversal of 320401240 is 42104023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320401243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004976 + ... + 4005055.

It is an arithmetic number, because the mean of its divisors is an integer number (45056430).

Almost surely, 2^320401240 is an apocalyptic number.

It is an amenable number.

320401240 is an abundant number, since it is smaller than the sum of its proper divisors (400501640).

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

320401240 is a wasteful number, since it uses less digits than its factorization.

320401240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8010042 (or 8010038 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 320401240 is about 17899.7553055901. The cubic root of 320401240 is about 684.2761387468.

Adding to 320401240 its reverse (42104023), we get a palindrome (362505263).

The spelling of 320401240 in words is "three hundred twenty million, four hundred one thousand, two hundred forty".