1978946 has 8 divisors (see below), whose sum is σ = 3037584. Its totient is φ = 966420.

The previous prime is 1978927. The next prime is 1978981. The reversal of 1978946 is 6498791.

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

It is a junction number, because it is equal to n+sod(n) for n = 1978897 and 1978906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11420 + ... + 11591.

It is an arithmetic number, because the mean of its divisors is an integer number (379698).

2^1978946 is an apocalyptic number.

1978946 is a deficient number, since it is larger than the sum of its proper divisors (1058638).

1978946 is a wasteful number, since it uses less digits than its factorization.

1978946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23056.

The product of its digits is 108864, while the sum is 44.

The square root of 1978946 is about 1406.7501555003. The cubic root of 1978946 is about 125.5484382051.

The spelling of 1978946 in words is "one million, nine hundred seventy-eight thousand, nine hundred forty-six".