1263439 has 4 divisors (see below), whose sum is σ = 1297624. Its totient is φ = 1229256.

The previous prime is 1263403. The next prime is 1263461. The reversal of 1263439 is 9343621.

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 1263439 - 2⁹ = 1262927 is a prime.

It is a Duffinian number.

1263439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263499) 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, 17037 + ... + 17110.

It is an arithmetic number, because the mean of its divisors is an integer number (324406).

2^1263439 is an apocalyptic number.

1263439 is a deficient number, since it is larger than the sum of its proper divisors (34185).

1263439 is an equidigital number, since it uses as much as digits as its factorization.

1263439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34184.

The product of its digits is 3888, while the sum is 28.

The square root of 1263439 is about 1124.0280245617. The cubic root of 1263439 is about 108.1064051911.

The spelling of 1263439 in words is "one million, two hundred sixty-three thousand, four hundred thirty-nine".