1249865 has 4 divisors (see below), whose sum is σ = 1499844. Its totient is φ = 999888.

The previous prime is 1249861. The next prime is 1249873. The reversal of 1249865 is 5689421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5689421 = 1259 ⋅4519.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 635209 = 784^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249865 - 2² = 1249861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249861) 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, 124982 + ... + 124991.

It is an arithmetic number, because the mean of its divisors is an integer number (374961).

2^1249865 is an apocalyptic number.

It is an amenable number.

1249865 is a deficient number, since it is larger than the sum of its proper divisors (249979).

1249865 is an equidigital number, since it uses as much as digits as its factorization.

1249865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249978.

The product of its digits is 17280, while the sum is 35.

The square root of 1249865 is about 1117.9736132843. The cubic root of 1249865 is about 107.7178563795.

The spelling of 1249865 in words is "one million, two hundred forty-nine thousand, eight hundred sixty-five".