1978286 has 8 divisors (see below), whose sum is σ = 2979504. Its totient is φ = 985120.

The previous prime is 1978267. The next prime is 1978289. The reversal of 1978286 is 6828791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 2406.

It is an arithmetic number, because the mean of its divisors is an integer number (372438).

2^1978286 is an apocalyptic number.

1978286 is a deficient number, since it is larger than the sum of its proper divisors (1001218).

1978286 is a wasteful number, since it uses less digits than its factorization.

1978286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026.

The product of its digits is 48384, while the sum is 41.

The square root of 1978286 is about 1406.5155527046. The cubic root of 1978286 is about 125.5344793969.

The spelling of 1978286 in words is "one million, nine hundred seventy-eight thousand, two hundred eighty-six".