1979847 has 6 divisors (see below), whose sum is σ = 2859792. Its totient is φ = 1319892.

The previous prime is 1979827. The next prime is 1979891. The reversal of 1979847 is 7489791.

It is not a de Polignac number, because 1979847 - 2¹² = 1975751 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109983 + ... + 110000.

It is an arithmetic number, because the mean of its divisors is an integer number (476632).

2^1979847 is an apocalyptic number.

1979847 is a deficient number, since it is larger than the sum of its proper divisors (879945).

1979847 is a wasteful number, since it uses less digits than its factorization.

1979847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219989 (or 219986 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1979847 is about 1407.0703607141. The cubic root of 1979847 is about 125.5674890837.

The spelling of 1979847 in words is "one million, nine hundred seventy-nine thousand, eight hundred forty-seven".