1143978 has 16 divisors (see below), whose sum is σ = 2496096. Its totient is φ = 346640.

The previous prime is 1143977. The next prime is 1144001. The reversal of 1143978 is 8793411.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1143977) 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, 8601 + ... + 8732.

It is an arithmetic number, because the mean of its divisors is an integer number (156006).

2^1143978 is an apocalyptic number.

1143978 is an abundant number, since it is smaller than the sum of its proper divisors (1352118).

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

1143978 is a wasteful number, since it uses less digits than its factorization.

1143978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349.

The product of its digits is 6048, while the sum is 33.

The square root of 1143978 is about 1069.5690721033. The cubic root of 1143978 is about 104.5857602050.

The spelling of 1143978 in words is "one million, one hundred forty-three thousand, nine hundred seventy-eight".