1816387394 has 8 divisors (see below), whose sum is σ = 2725002000. Its totient is φ = 908053396.

The previous prime is 1816387379. The next prime is 1816387399. The reversal of 1816387394 is 4937836181.

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

It is a super-2 number, since 2×1816387394² = 6598526330164222472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1816387399) 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, 53144 + ... + 80355.

It is an arithmetic number, because the mean of its divisors is an integer number (340625250).

Almost surely, 2^1816387394 is an apocalyptic number.

1816387394 is a deficient number, since it is larger than the sum of its proper divisors (908614606).

1816387394 is a wasteful number, since it uses less digits than its factorization.

1816387394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140304.

The product of its digits is 870912, while the sum is 50.

The square root of 1816387394 is about 42619.0965882666. The cubic root of 1816387394 is about 1220.1207875571.

The spelling of 1816387394 in words is "one billion, eight hundred sixteen million, three hundred eighty-seven thousand, three hundred ninety-four".