1978716 has 12 divisors (see below), whose sum is σ = 4617032. Its totient is φ = 659568.

The previous prime is 1978709. The next prime is 1978727. The reversal of 1978716 is 6178791.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 82435 + ... + 82458.

2^1978716 is an apocalyptic number.

It is an amenable number.

1978716 is an abundant number, since it is smaller than the sum of its proper divisors (2638316).

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

1978716 is a wasteful number, since it uses less digits than its factorization.

1978716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164900 (or 164898 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 1978716 is about 1406.6684044223. The cubic root of 1978716 is about 125.5435741243.

The spelling of 1978716 in words is "one million, nine hundred seventy-eight thousand, seven hundred sixteen".