18228723394 has 16 divisors (see below), whose sum is σ = 31397345856. Its totient is φ = 7775283600.

The previous prime is 18228723377. The next prime is 18228723419. The reversal of 18228723394 is 49332782281.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3082477 + ... + 3088384.

It is an arithmetic number, because the mean of its divisors is an integer number (1962334116).

Almost surely, 2^18228723394 is an apocalyptic number.

18228723394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18228723394 is a deficient number, since it is larger than the sum of its proper divisors (13168622462).

18228723394 is a wasteful number, since it uses less digits than its factorization.

18228723394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171081.

The product of its digits is 1161216, while the sum is 49.

The spelling of 18228723394 in words is "eighteen billion, two hundred twenty-eight million, seven hundred twenty-three thousand, three hundred ninety-four".