1979147 has 2 divisors, whose sum is σ = 1979148. Its totient is φ = 1979146.

The previous prime is 1979143. The next prime is 1979149. The reversal of 1979147 is 7419791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1979147 - 2² = 1979143 is a prime.

It is a super-3 number, since 3×1979147³ = 23257092053330428569, which contains 333 as substring.

Together with 1979149, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979147.

It is not a weakly prime, because it can be changed into another prime (1979141) 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 as a sum of consecutive naturals, namely, 989573 + 989574.

It is an arithmetic number, because the mean of its divisors is an integer number (989574).

2^1979147 is an apocalyptic number.

1979147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979147 is an equidigital number, since it uses as much as digits as its factorization.

1979147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 38.

The square root of 1979147 is about 1406.8215949437. The cubic root of 1979147 is about 125.5526886801.

The spelling of 1979147 in words is "one million, nine hundred seventy-nine thousand, one hundred forty-seven".