1187998 has 8 divisors (see below), whose sum is σ = 2036592. Its totient is φ = 509136.

The previous prime is 1187993. The next prime is 1187999. The reversal of 1187998 is 8997811.

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

It is a super-2 number, since 2×1187998² = 2822678496008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187993) 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, 42415 + ... + 42442.

It is an arithmetic number, because the mean of its divisors is an integer number (254574).

2^1187998 is an apocalyptic number.

1187998 is a deficient number, since it is larger than the sum of its proper divisors (848594).

1187998 is an equidigital number, since it uses as much as digits as its factorization.

1187998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84866.

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

The square root of 1187998 is about 1089.9532100049. The cubic root of 1187998 is about 105.9103906263.

The spelling of 1187998 in words is "one million, one hundred eighty-seven thousand, nine hundred ninety-eight".