1978122 has 8 divisors (see below), whose sum is σ = 3956256. Its totient is φ = 659372.

The previous prime is 1978117. The next prime is 1978153. The reversal of 1978122 is 2218791.

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

1978122 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978122.

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, 164838 + ... + 164849.

It is an arithmetic number, because the mean of its divisors is an integer number (494532).

2^1978122 is an apocalyptic number.

1978122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1978122 is a wasteful number, since it uses less digits than its factorization.

1978122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329692.

The product of its digits is 2016, while the sum is 30.

The square root of 1978122 is about 1406.4572513944. The cubic root of 1978122 is about 125.5310103630.

The spelling of 1978122 in words is "one million, nine hundred seventy-eight thousand, one hundred twenty-two".