1187859 has 4 divisors (see below), whose sum is σ = 1583816. Its totient is φ = 791904.

The previous prime is 1187839. The next prime is 1187863. The reversal of 1187859 is 9587811.

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

It is not a de Polignac number, because 1187859 - 2¹⁹ = 663571 is a prime.

It is a super-2 number, since 2×1187859² = 2822018007762, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187819) 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, 197974 + ... + 197979.

It is an arithmetic number, because the mean of its divisors is an integer number (395954).

2^1187859 is an apocalyptic number.

1187859 is a deficient number, since it is larger than the sum of its proper divisors (395957).

1187859 is an equidigital number, since it uses as much as digits as its factorization.

1187859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395956.

The product of its digits is 20160, while the sum is 39.

The square root of 1187859 is about 1089.8894439346. The cubic root of 1187859 is about 105.9062598341.

The spelling of 1187859 in words is "one million, one hundred eighty-seven thousand, eight hundred fifty-nine".