18412019 has 4 divisors (see below), whose sum is σ = 18433800. Its totient is φ = 18390240.

The previous prime is 18412001. The next prime is 18412027. The reversal of 18412019 is 91021481.

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 18412019 - 2⁸ = 18411763 is a prime.

It is a super-2 number, since 2×18412019² = 678004887312722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18412039) 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, 9569 + ... + 11330.

It is an arithmetic number, because the mean of its divisors is an integer number (4608450).

Almost surely, 2^18412019 is an apocalyptic number.

18412019 is a deficient number, since it is larger than the sum of its proper divisors (21781).

18412019 is an equidigital number, since it uses as much as digits as its factorization.

18412019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21780.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18412019 is about 4290.9228611104. The cubic root of 18412019 is about 264.0586942883.

The spelling of 18412019 in words is "eighteen million, four hundred twelve thousand, nineteen".