400720324 has 9 divisors (see below), whose sum is σ = 701330637. Its totient is φ = 200340144.

The previous prime is 400720301. The next prime is 400720351. The reversal of 400720324 is 423027004.

The square root of 400720324 is 20018.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 399280324 + 1440000 = 19982^2 + 1200^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400720295 and 400720304.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 35032 + ... + 45040.

Almost surely, 2^400720324 is an apocalyptic number.

400720324 is the 20018-th square number.

It is an amenable number.

400720324 is a deficient number, since it is larger than the sum of its proper divisors (300610313).

400720324 is an frugal number, since it uses more digits than its factorization.

400720324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20022 (or 10011 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The cubic root of 400720324 is about 737.2483172219.

Adding to 400720324 its reverse (423027004), we get a palindrome (823747328).

The spelling of 400720324 in words is "four hundred million, seven hundred twenty thousand, three hundred twenty-four".