1979685 has 48 divisors (see below), whose sum is σ = 3734640. Its totient is φ = 967680.

The previous prime is 1979683. The next prime is 1979689. The reversal of 1979685 is 5869791.

It can be written as a sum of positive squares in 8 ways, for example, as 25281 + 1954404 = 159^2 + 1398^2 .

It is not a de Polignac number, because 1979685 - 2¹ = 1979683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1979685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48265 + ... + 48305.

It is an arithmetic number, because the mean of its divisors is an integer number (77805).

2^1979685 is an apocalyptic number.

1979685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1979685 is a deficient number, since it is larger than the sum of its proper divisors (1754955).

1979685 is a wasteful number, since it uses less digits than its factorization.

1979685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 115 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1979685 is about 1407.0127931188. The cubic root of 1979685 is about 125.5640641577.

It can be divided in two parts, 19796 and 85, that added together give a square (19881 = 141²).

The spelling of 1979685 in words is "one million, nine hundred seventy-nine thousand, six hundred eighty-five".