1978670 has 16 divisors (see below), whose sum is σ = 3684960. Its totient is φ = 764064.

The previous prime is 1978663. The next prime is 1978673. The reversal of 1978670 is 768791.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978673) by changing a digit.

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, 3122 + ... + 3701.

It is an arithmetic number, because the mean of its divisors is an integer number (230310).

2^1978670 is an apocalyptic number.

1978670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978670 is a deficient number, since it is larger than the sum of its proper divisors (1706290).

1978670 is a wasteful number, since it uses less digits than its factorization.

1978670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6859.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1978670 is about 1406.6520536366. The cubic root of 1978670 is about 125.5426012629.

The spelling of 1978670 in words is "one million, nine hundred seventy-eight thousand, six hundred seventy".