1263906 has 36 divisors (see below), whose sum is σ = 3187782. Its totient is φ = 360864.

The previous prime is 1263887. The next prime is 1263917. The reversal of 1263906 is 6093621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 370881 = 945^2 + 609^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1263906.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 166 + ... + 1598.

2^1263906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1593891).

1263906 is an abundant number, since it is smaller than the sum of its proper divisors (1923876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263906 is a wasteful number, since it uses less digits than its factorization.

1263906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 1263906 is about 1124.2357404032. The cubic root of 1263906 is about 108.1197231991.

The spelling of 1263906 in words is "one million, two hundred sixty-three thousand, nine hundred six".