1249855 has 4 divisors (see below), whose sum is σ = 1499832. Its totient is φ = 999880.

The previous prime is 1249849. The next prime is 1249861. The reversal of 1249855 is 5589421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5589421 = 227 ⋅24623.

It is an interprime number because it is at equal distance from previous prime (1249849) and next prime (1249861).

It is not a de Polignac number, because 1249855 - 2³ = 1249847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1249855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124981 + ... + 124990.

It is an arithmetic number, because the mean of its divisors is an integer number (374958).

2^1249855 is an apocalyptic number.

1249855 is a deficient number, since it is larger than the sum of its proper divisors (249977).

1249855 is an equidigital number, since it uses as much as digits as its factorization.

1249855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249976.

The product of its digits is 14400, while the sum is 34.

The square root of 1249855 is about 1117.9691408979. The cubic root of 1249855 is about 107.7175691001.

The spelling of 1249855 in words is "one million, two hundred forty-nine thousand, eight hundred fifty-five".