1812019 has 4 divisors (see below), whose sum is σ = 1976760. Its totient is φ = 1647280.

The previous prime is 1811993. The next prime is 1812037. The reversal of 1812019 is 9102181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1812019 - 2⁵ = 1811987 is a prime.

It is a super-2 number, since 2×1812019² = 6566825712722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812059) 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, 82354 + ... + 82375.

It is an arithmetic number, because the mean of its divisors is an integer number (494190).

2^1812019 is an apocalyptic number.

1812019 is a deficient number, since it is larger than the sum of its proper divisors (164741).

1812019 is a wasteful number, since it uses less digits than its factorization.

1812019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164740.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1812019 is about 1346.1125510150. The cubic root of 1812019 is about 121.9141876174.

The spelling of 1812019 in words is "one million, eight hundred twelve thousand, nineteen".