1249891 has 4 divisors (see below), whose sum is σ = 1323432. Its totient is φ = 1176352.

The previous prime is 1249873. The next prime is 1249901. The reversal of 1249891 is 1989421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1249891 - 2¹³ = 1241699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36745 + ... + 36778.

It is an arithmetic number, because the mean of its divisors is an integer number (330858).

2^1249891 is an apocalyptic number.

1249891 is a deficient number, since it is larger than the sum of its proper divisors (73541).

1249891 is an equidigital number, since it uses as much as digits as its factorization.

1249891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73540.

The product of its digits is 5184, while the sum is 34.

The square root of 1249891 is about 1117.9852414053. The cubic root of 1249891 is about 107.7186032988.

The spelling of 1249891 in words is "one million, two hundred forty-nine thousand, eight hundred ninety-one".