1968139 has 2 divisors, whose sum is σ = 1968140. Its totient is φ = 1968138.

The previous prime is 1968137. The next prime is 1968149. The reversal of 1968139 is 9318691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1968139 - 2¹ = 1968137 is a prime.

It is a super-2 number, since 2×1968139² = 7747142246642, which contains 22 as substring.

Together with 1968137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1968098 and 1968107.

It is not a weakly prime, because it can be changed into another prime (1968137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984069 + 984070.

It is an arithmetic number, because the mean of its divisors is an integer number (984070).

2^1968139 is an apocalyptic number.

1968139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968139 is an equidigital number, since it uses as much as digits as its factorization.

1968139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 1968139 is about 1402.9037743195. The cubic root of 1968139 is about 125.3194814240.

The spelling of 1968139 in words is "one million, nine hundred sixty-eight thousand, one hundred thirty-nine".