1121978 has 16 divisors (see below), whose sum is σ = 1977696. Its totient is φ = 470640.

The previous prime is 1121947. The next prime is 1121987. The reversal of 1121978 is 8791211.

It is a self number, because there is not a number n which added to its sum of digits gives 1121978.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676 + ... + 2247.

It is an arithmetic number, because the mean of its divisors is an integer number (123606).

2^1121978 is an apocalyptic number.

1121978 is a deficient number, since it is larger than the sum of its proper divisors (855718).

1121978 is a wasteful number, since it uses less digits than its factorization.

1121978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949.

The product of its digits is 1008, while the sum is 29.

The square root of 1121978 is about 1059.2346293433. The cubic root of 1121978 is about 103.9109815190.

The spelling of 1121978 in words is "one million, one hundred twenty-one thousand, nine hundred seventy-eight".