501400320 has 144 divisors (see below), whose sum is σ = 1645092960. Its totient is φ = 130056192.

The previous prime is 501400307. The next prime is 501400321. The reversal of 501400320 is 23004105.

It is a super-2 number, since 2×501400320² = 502804561792204800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 501400320.

It is not an unprimeable number, because it can be changed into a prime (501400321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140316 + ... + 143844.

Almost surely, 2^501400320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501400320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822546480).

501400320 is an abundant number, since it is smaller than the sum of its proper divisors (1143692640).

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

501400320 is a wasteful number, since it uses less digits than its factorization.

501400320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 501400320 is about 22391.9699892618. The cubic root of 501400320 is about 794.4407918213.

Adding to 501400320 its reverse (23004105), we get a palindrome (524404425).

The spelling of 501400320 in words is "five hundred one million, four hundred thousand, three hundred twenty".