40040051923 has 4 divisors (see below), whose sum is σ = 40057841848. Its totient is φ = 40022262000.

The previous prime is 40040051911. The next prime is 40040051927. The reversal of 40040051923 is 32915004004.

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 40040051923 - 2⁹ = 40040051411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40040051891 and 40040051900.

It is not an unprimeable number, because it can be changed into a prime (40040051927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8891586 + ... + 8896087.

It is an arithmetic number, because the mean of its divisors is an integer number (10014460462).

Almost surely, 2^40040051923 is an apocalyptic number.

40040051923 is a deficient number, since it is larger than the sum of its proper divisors (17789925).

40040051923 is a wasteful number, since it uses less digits than its factorization.

40040051923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17789924.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 40040051923 its reverse (32915004004), we get a palindrome (72955055927).

The spelling of 40040051923 in words is "forty billion, forty million, fifty-one thousand, nine hundred twenty-three".