1265143 has 4 divisors (see below), whose sum is σ = 1380168. Its totient is φ = 1150120.

The previous prime is 1265129. The next prime is 1265167. The reversal of 1265143 is 3415621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3415621 = 11 ⋅310511.

It is a cyclic number.

It is not a de Polignac number, because 1265143 - 2⁵ = 1265111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265113) 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, 57496 + ... + 57517.

It is an arithmetic number, because the mean of its divisors is an integer number (345042).

2^1265143 is an apocalyptic number.

1265143 is a deficient number, since it is larger than the sum of its proper divisors (115025).

1265143 is a wasteful number, since it uses less digits than its factorization.

1265143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115024.

The product of its digits is 720, while the sum is 22.

The square root of 1265143 is about 1124.7857573778. The cubic root of 1265143 is about 108.1549843891.

The spelling of 1265143 in words is "one million, two hundred sixty-five thousand, one hundred forty-three".