1978146 has 12 divisors (see below), whose sum is σ = 4286022. Its totient is φ = 659376.

The previous prime is 1978117. The next prime is 1978153. The reversal of 1978146 is 6418791.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 114921 = 1365^2 + 339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1978146.

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 5 ways as a sum of consecutive naturals, for example, 54931 + ... + 54966.

2^1978146 is an apocalyptic number.

1978146 is an abundant number, since it is smaller than the sum of its proper divisors (2307876).

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

1978146 is a wasteful number, since it uses less digits than its factorization.

1978146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109905 (or 109902 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1978146 is about 1406.4657834444. The cubic root of 1978146 is about 125.5315180385.

The spelling of 1978146 in words is "one million, nine hundred seventy-eight thousand, one hundred forty-six".