19218740423 has 8 divisors (see below), whose sum is σ = 19945392480. Its totient is φ = 18496350880.

The previous prime is 19218740419. The next prime is 19218740461. The reversal of 19218740423 is 32404781291.

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

It is a cyclic number.

It is not a de Polignac number, because 19218740423 - 2² = 19218740419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19218740413) 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, 1056440 + ... + 1074477.

It is an arithmetic number, because the mean of its divisors is an integer number (2493174060).

Almost surely, 2^19218740423 is an apocalyptic number.

19218740423 is a deficient number, since it is larger than the sum of its proper divisors (726652057).

19218740423 is a wasteful number, since it uses less digits than its factorization.

19218740423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131257.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 19218740423 in words is "nineteen billion, two hundred eighteen million, seven hundred forty thousand, four hundred twenty-three".