1972147 has 2 divisors, whose sum is σ = 1972148. Its totient is φ = 1972146.

The previous prime is 1972133. The next prime is 1972169. The reversal of 1972147 is 7412791.

It is a weak prime.

It is an emirp because it is prime and its reverse (7412791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1972177) 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 as a sum of consecutive naturals, namely, 986073 + 986074.

It is an arithmetic number, because the mean of its divisors is an integer number (986074).

2^1972147 is an apocalyptic number.

1972147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972147 is an equidigital number, since it uses as much as digits as its factorization.

1972147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 1972147 is about 1404.3315135679. The cubic root of 1972147 is about 125.4044923424.

The spelling of 1972147 in words is "one million, nine hundred seventy-two thousand, one hundred forty-seven".