1861115 has 4 divisors (see below), whose sum is σ = 2233344. Its totient is φ = 1488888.

The previous prime is 1861103. The next prime is 1861121. The reversal of 1861115 is 5111681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5111681 = 23 ⋅222247.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861115 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186107 + ... + 186116.

It is an arithmetic number, because the mean of its divisors is an integer number (558336).

2^1861115 is an apocalyptic number.

1861115 is a deficient number, since it is larger than the sum of its proper divisors (372229).

1861115 is an equidigital number, since it uses as much as digits as its factorization.

1861115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372228.

The product of its digits is 240, while the sum is 23.

The square root of 1861115 is about 1364.2268872882. The cubic root of 1861115 is about 123.0054638770.

Adding to 1861115 its reverse (5111681), we get a palindrome (6972796).

The spelling of 1861115 in words is "one million, eight hundred sixty-one thousand, one hundred fifteen".