1818390143 has 8 divisors (see below), whose sum is σ = 1898635488. Its totient is φ = 1738243584.

The previous prime is 1818390131. The next prime is 1818390173. The reversal of 1818390143 is 3410938181.

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

It is not a de Polignac number, because 1818390143 - 2¹⁰ = 1818389119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1818390097 and 1818390106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818390113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14255 + ... + 61967.

It is an arithmetic number, because the mean of its divisors is an integer number (237329436).

Almost surely, 2^1818390143 is an apocalyptic number.

1818390143 is a deficient number, since it is larger than the sum of its proper divisors (80245345).

1818390143 is a wasteful number, since it uses less digits than its factorization.

1818390143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49393.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1818390143 is about 42642.5860261781. The cubic root of 1818390143 is about 1220.5690579614.

The spelling of 1818390143 in words is "one billion, eight hundred eighteen million, three hundred ninety thousand, one hundred forty-three".