1188978 has 16 divisors (see below), whose sum is σ = 2717760. Its totient is φ = 339696.

The previous prime is 1188977. The next prime is 1188991. The reversal of 1188978 is 8798811.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 28309 = 1188978 / (1 + 1 + 8 + 8 + 9 + 7 + 8).

It is not an unprimeable number, because it can be changed into a prime (1188973) 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, 14113 + ... + 14196.

It is an arithmetic number, because the mean of its divisors is an integer number (169860).

2^1188978 is an apocalyptic number.

1188978 is an abundant number, since it is smaller than the sum of its proper divisors (1528782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1188978 is a wasteful number, since it uses less digits than its factorization.

1188978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28321.

The product of its digits is 32256, while the sum is 42.

The square root of 1188978 is about 1090.4026779131. The cubic root of 1188978 is about 105.9395050569.

The spelling of 1188978 in words is "one million, one hundred eighty-eight thousand, nine hundred seventy-eight".