1249739 has 2 divisors, whose sum is σ = 1249740. Its totient is φ = 1249738.

The previous prime is 1249733. The next prime is 1249741. The reversal of 1249739 is 9379421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1249739 - 2²⁰ = 201163 is a prime.

Together with 1249741, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1249699 and 1249708.

It is not a weakly prime, because it can be changed into another prime (1249733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624869 + 624870.

It is an arithmetic number, because the mean of its divisors is an integer number (624870).

2^1249739 is an apocalyptic number.

1249739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249739 is an equidigital number, since it uses as much as digits as its factorization.

1249739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 1249739 is about 1117.9172599079. The cubic root of 1249739 is about 107.7142365470.

The spelling of 1249739 in words is "one million, two hundred forty-nine thousand, seven hundred thirty-nine".