40287979 has 2 divisors, whose sum is σ = 40287980. Its totient is φ = 40287978.

The previous prime is 40287889. The next prime is 40287997. The reversal of 40287979 is 97978204.

Together with next prime (40287997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40287979 - 2⁷ = 40287851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40287479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20143989 + 20143990.

It is an arithmetic number, because the mean of its divisors is an integer number (20143990).

Almost surely, 2^40287979 is an apocalyptic number.

40287979 is a deficient number, since it is larger than the sum of its proper divisors (1).

40287979 is an equidigital number, since it uses as much as digits as its factorization.

40287979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 40287979 is about 6347.2812289988. The cubic root of 40287979 is about 342.8139561758.

The spelling of 40287979 in words is "forty million, two hundred eighty-seven thousand, nine hundred seventy-nine".