40563721 has 16 divisors (see below), whose sum is σ = 46267200. Its totient is φ = 35224000.

The previous prime is 40563713. The next prime is 40563793. The reversal of 40563721 is 12736504.

It is a cyclic number.

It is not a de Polignac number, because 40563721 - 2³ = 40563713 is a prime.

It is a super-2 number, since 2×40563721² = 3290830922731682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40563721.

It is not an unprimeable number, because it can be changed into a prime (40563821) 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, 31590 + ... + 32848.

It is an arithmetic number, because the mean of its divisors is an integer number (2891700).

Almost surely, 2^40563721 is an apocalyptic number.

It is an amenable number.

40563721 is a deficient number, since it is larger than the sum of its proper divisors (5703479).

40563721 is a wasteful number, since it uses less digits than its factorization.

40563721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 40563721 is about 6368.9654575920. The cubic root of 40563721 is about 343.5942829261.

It can be divided in two parts, 4056 and 3721, that added together give a palindrome (7777).

The spelling of 40563721 in words is "forty million, five hundred sixty-three thousand, seven hundred twenty-one".