7320400 has 30 divisors (see below), whose sum is σ = 17588222. Its totient is φ = 2928000.

The previous prime is 7320359. The next prime is 7320403. The reversal of 7320400 is 40237.

It can be written as a sum of positive squares in 3 ways, for example, as 51984 + 7268416 = 228^2 + 2696^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7320403) 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 5 ways as a sum of consecutive naturals, for example, 8751 + ... + 9550.

Almost surely, 2^7320400 is an apocalyptic number.

It is an amenable number.

7320400 is an abundant number, since it is smaller than the sum of its proper divisors (10267822).

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

7320400 is a wasteful number, since it uses less digits than its factorization.

7320400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18319 (or 18308 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 7320400 is about 2705.6237728110. The cubic root of 7320400 is about 194.1682743046.

Adding to 7320400 its reverse (40237), we get a palindrome (7360637).

The spelling of 7320400 in words is "seven million, three hundred twenty thousand, four hundred".