1968739 has 2 divisors, whose sum is σ = 1968740. Its totient is φ = 1968738.

The previous prime is 1968721. The next prime is 1968749. The reversal of 1968739 is 9378691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1968739 - 2⁷ = 1968611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1968695 and 1968704.

It is not a weakly prime, because it can be changed into another prime (1968749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984369 + 984370.

It is an arithmetic number, because the mean of its divisors is an integer number (984370).

2^1968739 is an apocalyptic number.

1968739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968739 is an equidigital number, since it uses as much as digits as its factorization.

1968739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 1968739 is about 1403.1176002032. The cubic root of 1968739 is about 125.3322149503.

The spelling of 1968739 in words is "one million, nine hundred sixty-eight thousand, seven hundred thirty-nine".