1861199 has 4 divisors (see below), whose sum is σ = 1865040. Its totient is φ = 1857360.

The previous prime is 1861187. The next prime is 1861219. The reversal of 1861199 is 9911681.

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 1861199 - 2¹⁶ = 1795663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869199) 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, 1067 + ... + 2204.

It is an arithmetic number, because the mean of its divisors is an integer number (466260).

2^1861199 is an apocalyptic number.

1861199 is a deficient number, since it is larger than the sum of its proper divisors (3841).

1861199 is an equidigital number, since it uses as much as digits as its factorization.

1861199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its digits is 3888, while the sum is 35.

The square root of 1861199 is about 1364.2576736086. The cubic root of 1861199 is about 123.0073144349.

The spelling of 1861199 in words is "one million, eight hundred sixty-one thousand, one hundred ninety-nine".