1263634 has 4 divisors (see below), whose sum is σ = 1895454. Its totient is φ = 631816.

The previous prime is 1263631. The next prime is 1263659. The reversal of 1263634 is 4363621.

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

It can be written as a sum of positive squares in only one way, i.e., 837225 + 426409 = 915^2 + 653^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1263599 and 1263608.

It is not an unprimeable number, because it can be changed into a prime (1263631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315907 + ... + 315910.

2^1263634 is an apocalyptic number.

1263634 is a deficient number, since it is larger than the sum of its proper divisors (631820).

1263634 is an equidigital number, since it uses as much as digits as its factorization.

1263634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631819.

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

The square root of 1263634 is about 1124.1147628245. The cubic root of 1263634 is about 108.1119666427. Note that the first 3 decimals are identical.

The spelling of 1263634 in words is "one million, two hundred sixty-three thousand, six hundred thirty-four".