1978022 has 4 divisors (see below), whose sum is σ = 2967036. Its totient is φ = 989010.

The previous prime is 1978021. The next prime is 1978027. The reversal of 1978022 is 2208791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494504 + ... + 494507.

It is an arithmetic number, because the mean of its divisors is an integer number (741759).

2^1978022 is an apocalyptic number.

1978022 is a deficient number, since it is larger than the sum of its proper divisors (989014).

1978022 is an equidigital number, since it uses as much as digits as its factorization.

1978022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989013.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1978022 is about 1406.4217006289. The cubic root of 1978022 is about 125.5288950044.

The spelling of 1978022 in words is "one million, nine hundred seventy-eight thousand, twenty-two".