40001999969 has 8 divisors (see below), whose sum is σ = 40385217600. Its totient is φ = 39618956016.

The previous prime is 40001999867. The next prime is 40001999971. The reversal of 40001999969 is 96999910004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40001999969 - 2¹⁶ = 40001934433 is a prime.

It is a super-2 number, since 2×40001999969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40001999369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445652 + ... + 527834.

It is an arithmetic number, because the mean of its divisors is an integer number (5048152200).

Almost surely, 2^40001999969 is an apocalyptic number.

It is an amenable number.

40001999969 is a deficient number, since it is larger than the sum of its proper divisors (383217631).

40001999969 is a wasteful number, since it uses less digits than its factorization.

40001999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86839.

The product of its (nonzero) digits is 1417176, while the sum is 56.

Adding to 40001999969 its sum of digits (56), we get a square (40002000025 = 200005²).

The spelling of 40001999969 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred sixty-nine".