40001999959 has 4 divisors (see below), whose sum is σ = 40030112416. Its totient is φ = 39973887504.

The previous prime is 40001999867. The next prime is 40001999971. The reversal of 40001999959 is 95999910004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40001999959 - 2⁷ = 40001999831 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 (40001991959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14054094 + ... + 14056939.

It is an arithmetic number, because the mean of its divisors is an integer number (10007528104).

Almost surely, 2^40001999959 is an apocalyptic number.

40001999959 is a deficient number, since it is larger than the sum of its proper divisors (28112457).

40001999959 is a wasteful number, since it uses less digits than its factorization.

40001999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28112456.

The product of its (nonzero) digits is 1180980, while the sum is 55.

The spelling of 40001999959 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".