40243999 has 4 divisors (see below), whose sum is σ = 40613320. Its totient is φ = 39874680.

The previous prime is 40243991. The next prime is 40244011. The reversal of 40243999 is 99934204.

40243999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40243999 - 2³ = 40243991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40243991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184497 + ... + 184714.

It is an arithmetic number, because the mean of its divisors is an integer number (10153330).

Almost surely, 2^40243999 is an apocalyptic number.

40243999 is a deficient number, since it is larger than the sum of its proper divisors (369321).

40243999 is a wasteful number, since it uses less digits than its factorization.

40243999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369320.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 40243999 is about 6343.8158075404. The cubic root of 40243999 is about 342.6891675275.

The spelling of 40243999 in words is "forty million, two hundred forty-three thousand, nine hundred ninety-nine".