1972739 has 2 divisors, whose sum is σ = 1972740. Its totient is φ = 1972738.

The previous prime is 1972721. The next prime is 1972741. The reversal of 1972739 is 9372791.

It is a strong prime.

It is an emirp because it is prime and its reverse (9372791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1972739 - 2⁸ = 1972483 is a prime.

Together with 1972741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1972939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986369 + 986370.

It is an arithmetic number, because the mean of its divisors is an integer number (986370).

2^1972739 is an apocalyptic number.

1972739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972739 is an equidigital number, since it uses as much as digits as its factorization.

1972739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 38.

The square root of 1972739 is about 1404.5422741947. The cubic root of 1972739 is about 125.4170390799.

The spelling of 1972739 in words is "one million, nine hundred seventy-two thousand, seven hundred thirty-nine".