16440383923 has 4 divisors (see below), whose sum is σ = 17155183248. Its totient is φ = 15725584600.

The previous prime is 16440383909. The next prime is 16440383959. The reversal of 16440383923 is 32938304461.

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 16440383923 - 2⁹ = 16440383411 is a prime.

It is a super-3 number, since 3×16440383923³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16440383923.

It is not an unprimeable number, because it can be changed into a prime (16440383963) 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, 357399628 + ... + 357399673.

It is an arithmetic number, because the mean of its divisors is an integer number (4288795812).

Almost surely, 2^16440383923 is an apocalyptic number.

16440383923 is a deficient number, since it is larger than the sum of its proper divisors (714799325).

16440383923 is an equidigital number, since it uses as much as digits as its factorization.

16440383923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714799324.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 16440383923 in words is "sixteen billion, four hundred forty million, three hundred eighty-three thousand, nine hundred twenty-three".