40001999867 has 2 divisors, whose sum is σ = 40001999868. Its totient is φ = 40001999866.

The previous prime is 40001999857. The next prime is 40001999971. The reversal of 40001999867 is 76899910004.

It is a happy number.

40001999867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40001999867 - 2⁶ = 40001999803 is a prime.

It is not a weakly prime, because it can be changed into another prime (40001999857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000999933 + 20000999934.

It is an arithmetic number, because the mean of its divisors is an integer number (20000999934).

Almost surely, 2^40001999867 is an apocalyptic number.

40001999867 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001999867 is an equidigital number, since it uses as much as digits as its factorization.

40001999867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 40001999867 in words is "forty billion, one million, nine hundred ninety-nine thousand, eight hundred sixty-seven".