40018679 has 2 divisors, whose sum is σ = 40018680. Its totient is φ = 40018678.

The previous prime is 40018669. The next prime is 40018691. The reversal of 40018679 is 97681004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40018679 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40018609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009339 + 20009340.

It is an arithmetic number, because the mean of its divisors is an integer number (20009340).

Almost surely, 2^40018679 is an apocalyptic number.

40018679 is a deficient number, since it is larger than the sum of its proper divisors (1).

40018679 is an equidigital number, since it uses as much as digits as its factorization.

40018679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 40018679 is about 6326.0318525913. The cubic root of 40018679 is about 342.0484154523.

The spelling of 40018679 in words is "forty million, eighteen thousand, six hundred seventy-nine".