40412721 has 16 divisors (see below), whose sum is σ = 54656000. Its totient is φ = 26558928.

The previous prime is 40412719. The next prime is 40412767. The reversal of 40412721 is 12721404.

It is a happy number.

It is not a de Polignac number, because 40412721 - 2¹ = 40412719 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 (40412711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 82740 + ... + 83226.

It is an arithmetic number, because the mean of its divisors is an integer number (3416000).

Almost surely, 2^40412721 is an apocalyptic number.

It is an amenable number.

40412721 is a deficient number, since it is larger than the sum of its proper divisors (14243279).

40412721 is a wasteful number, since it uses less digits than its factorization.

40412721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 40412721 is about 6357.1000464048. The cubic root of 40412721 is about 343.1674051858.

The spelling of 40412721 in words is "forty million, four hundred twelve thousand, seven hundred twenty-one".