40043638623 has 4 divisors (see below), whose sum is σ = 53391518168. Its totient is φ = 26695759080.

The previous prime is 40043638577. The next prime is 40043638627. The reversal of 40043638623 is 32683634004.

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

It is not a de Polignac number, because 40043638623 - 2²¹ = 40041541471 is a prime.

It is a super-2 number, since 2×40043638623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043638627) 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, 6673939768 + ... + 6673939773.

It is an arithmetic number, because the mean of its divisors is an integer number (13347879542).

Almost surely, 2^40043638623 is an apocalyptic number.

40043638623 is a deficient number, since it is larger than the sum of its proper divisors (13347879545).

40043638623 is a wasteful number, since it uses less digits than its factorization.

40043638623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347879544.

The product of its (nonzero) digits is 248832, while the sum is 39.

The spelling of 40043638623 in words is "forty billion, forty-three million, six hundred thirty-eight thousand, six hundred twenty-three".