1289978 has 16 divisors (see below), whose sum is σ = 2090880. Its totient is φ = 595056.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1289978 is 8799821.

It is not an unprimeable number, because it can be changed into a prime (1289971) 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, 851 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (130680).

2^1289978 is an apocalyptic number.

1289978 is a deficient number, since it is larger than the sum of its proper divisors (800902).

1289978 is a wasteful number, since it uses less digits than its factorization.

1289978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021.

The product of its digits is 72576, while the sum is 44.

The square root of 1289978 is about 1135.7719841588. The cubic root of 1289978 is about 108.8581045067.

The spelling of 1289978 in words is "one million, two hundred eighty-nine thousand, nine hundred seventy-eight".