1979678 has 4 divisors (see below), whose sum is σ = 2969520. Its totient is φ = 989838.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979678 is 8769791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8769791 = 1553 ⋅5647.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494918 + ... + 494921.

It is an arithmetic number, because the mean of its divisors is an integer number (742380).

2^1979678 is an apocalyptic number.

1979678 is a deficient number, since it is larger than the sum of its proper divisors (989842).

1979678 is an equidigital number, since it uses as much as digits as its factorization.

1979678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989841.

The product of its digits is 190512, while the sum is 47.

The square root of 1979678 is about 1407.0103055770. The cubic root of 1979678 is about 125.5639161629.

It can be divided in two parts, 19 and 79678, that added together give a palindrome (79697).

The spelling of 1979678 in words is "one million, nine hundred seventy-nine thousand, six hundred seventy-eight".