1678978 has 16 divisors (see below), whose sum is σ = 2946240. Its totient is φ = 702576.

The previous prime is 1678961. The next prime is 1678979. The reversal of 1678978 is 8798761.

It is not an unprimeable number, because it can be changed into a prime (1678979) 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, 793 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (184140).

2^1678978 is an apocalyptic number.

1678978 is a deficient number, since it is larger than the sum of its proper divisors (1267262).

1678978 is a wasteful number, since it uses less digits than its factorization.

1678978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841.

The product of its digits is 169344, while the sum is 46.

The square root of 1678978 is about 1295.7538346461. The cubic root of 1678978 is about 118.8543282598.

The spelling of 1678978 in words is "one million, six hundred seventy-eight thousand, nine hundred seventy-eight".