1263421 has 4 divisors (see below), whose sum is σ = 1266844. Its totient is φ = 1260000.

The previous prime is 1263403. The next prime is 1263461. The reversal of 1263421 is 1243621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243621 = 467 ⋅2663.

It can be written as a sum of positive squares in 2 ways, for example, as 235225 + 1028196 = 485^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263421 - 2¹¹ = 1261373 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 (1263461) 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, 1080 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (316711).

2^1263421 is an apocalyptic number.

It is an amenable number.

1263421 is a deficient number, since it is larger than the sum of its proper divisors (3423).

1263421 is an equidigital number, since it uses as much as digits as its factorization.

1263421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422.

The product of its digits is 288, while the sum is 19.

The square root of 1263421 is about 1124.0200176153. The cubic root of 1263421 is about 108.1058917975.

The spelling of 1263421 in words is "one million, two hundred sixty-three thousand, four hundred twenty-one".