40520320 has 32 divisors (see below), whose sum is σ = 96870420. Its totient is φ = 16207872.

The previous prime is 40520309. The next prime is 40520321. The reversal of 40520320 is 2302504.

It can be written as a sum of positive squares in 2 ways, for example, as 39841344 + 678976 = 6312^2 + 824^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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

It is a junction number, because it is equal to n+sod(n) for n = 40520294 and 40520303.

It is not an unprimeable number, because it can be changed into a prime (40520321) 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, 31017 + ... + 32296.

Almost surely, 2^40520320 is an apocalyptic number.

40520320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40520320 is an abundant number, since it is smaller than the sum of its proper divisors (56350100).

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

40520320 is an equidigital number, since it uses as much as digits as its factorization.

40520320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63332 (or 63320 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 40520320 is about 6365.5573204551. The cubic root of 40520320 is about 343.4716967273.

Adding to 40520320 its reverse (2302504), we get a palindrome (42822824).

The spelling of 40520320 in words is "forty million, five hundred twenty thousand, three hundred twenty".