1249643 has 2 divisors, whose sum is σ = 1249644. Its totient is φ = 1249642.

The previous prime is 1249631. The next prime is 1249657. The reversal of 1249643 is 3469421.

It is a weak prime.

It is an emirp because it is prime and its reverse (3469421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1249643 - 2⁴ = 1249627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624821 + 624822.

It is an arithmetic number, because the mean of its divisors is an integer number (624822).

2^1249643 is an apocalyptic number.

1249643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249643 is an equidigital number, since it uses as much as digits as its factorization.

1249643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 1249643 is about 1117.8743220953. The cubic root of 1249643 is about 107.7114784160.

The spelling of 1249643 in words is "one million, two hundred forty-nine thousand, six hundred forty-three".