1947979 has 12 divisors (see below), whose sum is σ = 2269512. Its totient is φ = 1664960.

The previous prime is 1947977. The next prime is 1947983. The reversal of 1947979 is 9797491.

It is not a de Polignac number, because 1947979 - 2¹ = 1947977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1947971) 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 11 ways as a sum of consecutive naturals, for example, 1584 + ... + 2530.

It is an arithmetic number, because the mean of its divisors is an integer number (189126).

2^1947979 is an apocalyptic number.

1947979 is a deficient number, since it is larger than the sum of its proper divisors (321533).

1947979 is a wasteful number, since it uses less digits than its factorization.

1947979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 975 counting only the distinct ones).

The product of its digits is 142884, while the sum is 46.

The square root of 1947979 is about 1395.7001827040. The cubic root of 1947979 is about 124.8901221098.

It can be divided in two parts, 1947 and 979, that added together give a triangular number (2926 = T₇₆).

The spelling of 1947979 in words is "one million, nine hundred forty-seven thousand, nine hundred seventy-nine".