1263643 has 4 divisors (see below), whose sum is σ = 1318608. Its totient is φ = 1208680.

The previous prime is 1263631. The next prime is 1263659. The reversal of 1263643 is 3463621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3463621 = 7 ⋅494803.

It is a cyclic number.

It is not a de Polignac number, because 1263643 - 2¹³ = 1255451 is a prime.

It is a super-3 number, since 3×1263643³ = 6053331284475326121, which contains 333 as substring.

It is a Duffinian number.

1263643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1263943) 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, 27448 + ... + 27493.

It is an arithmetic number, because the mean of its divisors is an integer number (329652).

2^1263643 is an apocalyptic number.

1263643 is a deficient number, since it is larger than the sum of its proper divisors (54965).

1263643 is an equidigital number, since it uses as much as digits as its factorization.

1263643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54964.

The product of its digits is 2592, while the sum is 25.

The square root of 1263643 is about 1124.1187659674. The cubic root of 1263643 is about 108.1122233113.

The spelling of 1263643 in words is "one million, two hundred sixty-three thousand, six hundred forty-three".