1290243 has 4 divisors (see below), whose sum is σ = 1720328. Its totient is φ = 860160.

The previous prime is 1290209. The next prime is 1290257. The reversal of 1290243 is 3420921.

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

It is not a de Polignac number, because 1290243 - 2⁹ = 1289731 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290203) 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, 215038 + ... + 215043.

It is an arithmetic number, because the mean of its divisors is an integer number (430082).

2^1290243 is an apocalyptic number.

1290243 is a deficient number, since it is larger than the sum of its proper divisors (430085).

1290243 is an equidigital number, since it uses as much as digits as its factorization.

1290243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430084.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1290243 is about 1135.8886389079. Note that the first 3 decimals coincide. The cubic root of 1290243 is about 108.8655582313.

The spelling of 1290243 in words is "one million, two hundred ninety thousand, two hundred forty-three".