1181887 has 8 divisors (see below), whose sum is σ = 1364000. Its totient is φ = 1003104.

The previous prime is 1181881. The next prime is 1181893. The reversal of 1181887 is 7881811.

It is an interprime number because it is at equal distance from previous prime (1181881) and next prime (1181893).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1181887 - 2³ = 1181879 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12 + ... + 1537.

It is an arithmetic number, because the mean of its divisors is an integer number (170500).

2^1181887 is an apocalyptic number.

1181887 is a deficient number, since it is larger than the sum of its proper divisors (182113).

1181887 is a wasteful number, since it uses less digits than its factorization.

1181887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665.

The product of its digits is 3584, while the sum is 34.

The square root of 1181887 is about 1087.1462643085. The cubic root of 1181887 is about 105.7284791719.

The spelling of 1181887 in words is "one million, one hundred eighty-one thousand, eight hundred eighty-seven".