40995721 has 16 divisors (see below), whose sum is σ = 47528208. Its totient is φ = 35020800.

The previous prime is 40995719. The next prime is 40995767. The reversal of 40995721 is 12759904.

It can be written as a sum of positive squares in 8 ways, for example, as 35721 + 40960000 = 189^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 40995721 - 2¹ = 40995719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40995781) 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, 11961 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (2970513).

Almost surely, 2^40995721 is an apocalyptic number.

It is an amenable number.

40995721 is a deficient number, since it is larger than the sum of its proper divisors (6532487).

40995721 is a wasteful number, since it uses less digits than its factorization.

40995721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 40995721 is about 6402.7900949508. The cubic root of 40995721 is about 344.8097277497.

The spelling of 40995721 in words is "forty million, nine hundred ninety-five thousand, seven hundred twenty-one".