1840393187818 has 16 divisors (see below), whose sum is σ = 2763933236064. Its totient is φ = 919082682640.

The previous prime is 1840393187803. The next prime is 1840393187819. The reversal of 1840393187818 is 8187813930481.

It is a super-2 number, since 2×1840393187818² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1840393187819) 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, 6365721 + ... + 6648547.

It is an arithmetic number, because the mean of its divisors is an integer number (172745827254).

Almost surely, 2^{1840393187818} is an apocalyptic number.

1840393187818 is a deficient number, since it is larger than the sum of its proper divisors (923540048246).

1840393187818 is a wasteful number, since it uses less digits than its factorization.

1840393187818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286757.

The product of its (nonzero) digits is 9289728, while the sum is 61.

The spelling of 1840393187818 in words is "one trillion, eight hundred forty billion, three hundred ninety-three million, one hundred eighty-seven thousand, eight hundred eighteen".