1979845 has 12 divisors (see below), whose sum is σ = 2764044. Its totient is φ = 1357440.

The previous prime is 1979827. The next prime is 1979891. The reversal of 1979845 is 5489791.

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 1285956 = 833^2 + 1134^2 .

It is not a de Polignac number, because 1979845 - 2⁷ = 1979717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3796 + ... + 4285.

It is an arithmetic number, because the mean of its divisors is an integer number (230337).

2^1979845 is an apocalyptic number.

It is an amenable number.

1979845 is a deficient number, since it is larger than the sum of its proper divisors (784199).

1979845 is an equidigital number, since it uses as much as digits as its factorization.

1979845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8100 (or 8093 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 1979845 is about 1407.0696500174. The cubic root of 1979845 is about 125.5674468018.

It can be divided in two parts, 197 and 9845, that multiplied together give a triangular number (1939465 = T₁₉₆₉).

The spelling of 1979845 in words is "one million, nine hundred seventy-nine thousand, eight hundred forty-five".