40907721 has 16 divisors (see below), whose sum is σ = 55635968. Its totient is φ = 26730000.

The previous prime is 40907707. The next prime is 40907723. The reversal of 40907721 is 12770904.

It is not a de Polignac number, because 40907721 - 2⁵ = 40907689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40907723) 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, 54096 + ... + 54846.

It is an arithmetic number, because the mean of its divisors is an integer number (3477248).

Almost surely, 2^40907721 is an apocalyptic number.

It is an amenable number.

40907721 is a deficient number, since it is larger than the sum of its proper divisors (14728247).

40907721 is a wasteful number, since it uses less digits than its factorization.

40907721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 40907721 is about 6395.9143990519. The cubic root of 40907721 is about 344.5628321186.

It can be divided in two parts, 4090 and 7721, that added together give a palindrome (11811).

The spelling of 40907721 in words is "forty million, nine hundred seven thousand, seven hundred twenty-one".