1812342489 has 16 divisors (see below), whose sum is σ = 2425073664. Its totient is φ = 1203930000.

The previous prime is 1812342481. The next prime is 1812342503. The reversal of 1812342489 is 9842432181.

It is not a de Polignac number, because 1812342489 - 2³ = 1812342481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1812342489.

It is not an unprimeable number, because it can be changed into a prime (1812342481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988944 + ... + 1989854.

It is an arithmetic number, because the mean of its divisors is an integer number (151567104).

Almost surely, 2^1812342489 is an apocalyptic number.

It is an amenable number.

1812342489 is a deficient number, since it is larger than the sum of its proper divisors (612731175).

1812342489 is an equidigital number, since it uses as much as digits as its factorization.

1812342489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548.

The product of its digits is 110592, while the sum is 42.

The square root of 1812342489 is about 42571.6160017446. The cubic root of 1812342489 is about 1219.2144205793.

The spelling of 1812342489 in words is "one billion, eight hundred twelve million, three hundred forty-two thousand, four hundred eighty-nine".