40287939 has 8 divisors (see below), whose sum is σ = 53761872. Its totient is φ = 26836320.

The previous prime is 40287889. The next prime is 40287979. The reversal of 40287939 is 93978204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40287939 - 2⁹ = 40287427 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40287939.

It is not an unprimeable number, because it can be changed into a prime (40287979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772 + ... + 9009.

It is an arithmetic number, because the mean of its divisors is an integer number (6720234).

Almost surely, 2^40287939 is an apocalyptic number.

40287939 is a deficient number, since it is larger than the sum of its proper divisors (13473933).

40287939 is a wasteful number, since it uses less digits than its factorization.

40287939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11157.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 40287939 is about 6347.2780780426. The cubic root of 40287939 is about 342.8138427213.

The spelling of 40287939 in words is "forty million, two hundred eighty-seven thousand, nine hundred thirty-nine".