1240739 has 2 divisors, whose sum is σ = 1240740. Its totient is φ = 1240738.

The previous prime is 1240717. The next prime is 1240741. The reversal of 1240739 is 9370421.

It is a strong prime.

It is an emirp because it is prime and its reverse (9370421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240739 - 2⁸ = 1240483 is a prime.

It is a super-2 number, since 2×1240739² = 3078866532242, which contains 22 as substring.

Together with 1240741, 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 (1240709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620369 + 620370.

It is an arithmetic number, because the mean of its divisors is an integer number (620370).

2^1240739 is an apocalyptic number.

1240739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240739 is an equidigital number, since it uses as much as digits as its factorization.

1240739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1240739 is about 1113.8846439376. The cubic root of 1240739 is about 107.4550452018.

The spelling of 1240739 in words is "one million, two hundred forty thousand, seven hundred thirty-nine".