1240691 has 2 divisors, whose sum is σ = 1240692. Its totient is φ = 1240690.

The previous prime is 1240669. The next prime is 1240699. The reversal of 1240691 is 1960421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1960421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1240699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620345 + 620346.

It is an arithmetic number, because the mean of its divisors is an integer number (620346).

2^1240691 is an apocalyptic number.

1240691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240691 is an equidigital number, since it uses as much as digits as its factorization.

1240691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1240691 is about 1113.8630975124. The cubic root of 1240691 is about 107.4536594930.

The spelling of 1240691 in words is "one million, two hundred forty thousand, six hundred ninety-one".