1979778 has 16 divisors (see below), whose sum is σ = 3983616. Its totient is φ = 655920.

The previous prime is 1979773. The next prime is 1979779. The reversal of 1979778 is 8779791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (248976).

2^1979778 is an apocalyptic number.

1979778 is an abundant number, since it is smaller than the sum of its proper divisors (2003838).

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

1979778 is a wasteful number, since it uses less digits than its factorization.

1979778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009.

The product of its digits is 222264, while the sum is 48.

The square root of 1979778 is about 1407.0458414707. The cubic root of 1979778 is about 125.5660303417.

It can be divided in two parts, 19 and 79778, that added together give a palindrome (79797).

The spelling of 1979778 in words is "one million, nine hundred seventy-nine thousand, seven hundred seventy-eight".