40123199991 has 16 divisors (see below), whose sum is σ = 61145086464. Its totient is φ = 22925678304.

The previous prime is 40123199959. The next prime is 40123200041. The reversal of 40123199991 is 19999132104.

It is a happy number.

It is not a de Polignac number, because 40123199991 - 2⁵ = 40123199959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40123199991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40123199911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211765 + ... + 353681.

It is an arithmetic number, because the mean of its divisors is an integer number (3821567904).

Almost surely, 2^40123199991 is an apocalyptic number.

40123199991 is a deficient number, since it is larger than the sum of its proper divisors (21021886473).

40123199991 is a wasteful number, since it uses less digits than its factorization.

40123199991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155390.

The product of its (nonzero) digits is 157464, while the sum is 48.

The spelling of 40123199991 in words is "forty billion, one hundred twenty-three million, one hundred ninety-nine thousand, nine hundred ninety-one".