1861087 has 4 divisors (see below), whose sum is σ = 1864360. Its totient is φ = 1857816.

The previous prime is 1861081. The next prime is 1861103. The reversal of 1861087 is 7801681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7801681 = 67 ⋅116443.

It is a cyclic number.

It is not a de Polignac number, because 1861087 - 2¹⁵ = 1828319 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 (1861081) 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, 537 + ... + 2002.

It is an arithmetic number, because the mean of its divisors is an integer number (466090).

2^1861087 is an apocalyptic number.

1861087 is a deficient number, since it is larger than the sum of its proper divisors (3273).

1861087 is an equidigital number, since it uses as much as digits as its factorization.

1861087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1861087 is about 1364.2166250270. The cubic root of 1861087 is about 123.0048470119.

The spelling of 1861087 in words is "one million, eight hundred sixty-one thousand, eighty-seven".