1198987 has 4 divisors (see below), whose sum is σ = 1237696. Its totient is φ = 1160280.

The previous prime is 1198979. The next prime is 1198991. The reversal of 1198987 is 7898911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7898911 = 193 ⋅40927.

It is a cyclic number.

It is not a de Polignac number, because 1198987 - 2³ = 1198979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198927) 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, 19308 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (309424).

2^1198987 is an apocalyptic number.

1198987 is a deficient number, since it is larger than the sum of its proper divisors (38709).

1198987 is an equidigital number, since it uses as much as digits as its factorization.

1198987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38708.

The product of its digits is 36288, while the sum is 43.

The square root of 1198987 is about 1094.9826482643. The cubic root of 1198987 is about 106.2359464688.

It can be divided in two parts, 119 and 8987, that multiplied together give a triangular number (1069453 = T₁₄₆₂).

The spelling of 1198987 in words is "one million, one hundred ninety-eight thousand, nine hundred eighty-seven".