18405740309 has 8 divisors (see below), whose sum is σ = 20361792960. Its totient is φ = 16496821600.

The previous prime is 18405740293. The next prime is 18405740323. The reversal of 18405740309 is 90304750481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18405740309 - 2⁴ = 18405740293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18405740209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11782664 + ... + 11784225.

It is an arithmetic number, because the mean of its divisors is an integer number (2545224120).

Almost surely, 2^18405740309 is an apocalyptic number.

It is an amenable number.

18405740309 is a deficient number, since it is larger than the sum of its proper divisors (1956052651).

18405740309 is a wasteful number, since it uses less digits than its factorization.

18405740309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23566971.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 18405740309 in words is "eighteen billion, four hundred five million, seven hundred forty thousand, three hundred nine".