40001999967 has 24 divisors (see below), whose sum is σ = 59265082448. Its totient is φ = 25985836800.

The previous prime is 40001999867. The next prime is 40001999971. The reversal of 40001999967 is 76999910004.

40001999967 is a `hidden beast` number, since 400 + 0 + 1 + 99 + 99 + 67 = 666.

It is not a de Polignac number, because 40001999967 - 2⁷ = 40001999839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40001999977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40167 + ... + 285687.

Almost surely, 2^40001999967 is an apocalyptic number.

40001999967 is a deficient number, since it is larger than the sum of its proper divisors (19263082481).

40001999967 is a wasteful number, since it uses less digits than its factorization.

40001999967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245991 (or 245988 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The spelling of 40001999967 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred sixty-seven".