1187978 has 12 divisors (see below), whose sum is σ = 1959090. Its totient is φ = 539880.

The previous prime is 1187947. The next prime is 1187981. The reversal of 1187978 is 8797811.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 543169 = 803^2 + 737^2 .

It is a super-2 number, since 2×1187978² = 2822583456968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2213 + ... + 2696.

2^1187978 is an apocalyptic number.

1187978 is a deficient number, since it is larger than the sum of its proper divisors (771112).

1187978 is a wasteful number, since it uses less digits than its factorization.

1187978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933 (or 4922 counting only the distinct ones).

The product of its digits is 28224, while the sum is 41.

The square root of 1187978 is about 1089.9440352605. The cubic root of 1187978 is about 105.9097962875.

The spelling of 1187978 in words is "one million, one hundred eighty-seven thousand, nine hundred seventy-eight".