40399679 has 2 divisors, whose sum is σ = 40399680. Its totient is φ = 40399678.

The previous prime is 40399663. The next prime is 40399691. The reversal of 40399679 is 97699304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40399679 - 2⁴ = 40399663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40399609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20199839 + 20199840.

It is an arithmetic number, because the mean of its divisors is an integer number (20199840).

Almost surely, 2^40399679 is an apocalyptic number.

40399679 is a deficient number, since it is larger than the sum of its proper divisors (1).

40399679 is an equidigital number, since it uses as much as digits as its factorization.

40399679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 40399679 is about 6356.0741814425. The cubic root of 40399679 is about 343.1304855333.

The spelling of 40399679 in words is "forty million, three hundred ninety-nine thousand, six hundred seventy-nine".