40001999369 has 2 divisors, whose sum is σ = 40001999370. Its totient is φ = 40001999368.

The previous prime is 40001999333. The next prime is 40001999383. The reversal of 40001999369 is 96399910004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28052230144 + 11949769225 = 167488^2 + 109315^2 .

It is a cyclic number.

It is not a de Polignac number, because 40001999369 - 2³² = 35707032073 is a prime.

It is a super-2 number, since 2×40001999369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40000999369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000999684 + 20000999685.

It is an arithmetic number, because the mean of its divisors is an integer number (20000999685).

Almost surely, 2^40001999369 is an apocalyptic number.

It is an amenable number.

40001999369 is a deficient number, since it is larger than the sum of its proper divisors (1).

40001999369 is an equidigital number, since it uses as much as digits as its factorization.

40001999369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 50.

The spelling of 40001999369 in words is "forty billion, one million, nine hundred ninety-nine thousand, three hundred sixty-nine".