40505280 has 56 divisors (see below), whose sum is σ = 128607312. Its totient is φ = 10801152.

The previous prime is 40505263. The next prime is 40505299. The reversal of 40505280 is 8250504.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40505280.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20137 + ... + 22056.

Almost surely, 2^40505280 is an apocalyptic number.

40505280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40505280 is an abundant number, since it is smaller than the sum of its proper divisors (88102032).

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

40505280 is a wasteful number, since it uses less digits than its factorization.

40505280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42213 (or 42203 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 40505280 is about 6364.3758531375. The cubic root of 40505280 is about 343.4291957995.

Adding to 40505280 its reverse (8250504), we get a palindrome (48755784).

The spelling of 40505280 in words is "forty million, five hundred five thousand, two hundred eighty".