1263997 has 8 divisors (see below), whose sum is σ = 1472256. Its totient is φ = 1062672.

The previous prime is 1263979. The next prime is 1264009. The reversal of 1263997 is 7993621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1263997 - 2¹⁵ = 1231229 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 (1263917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1333 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (184032).

2^1263997 is an apocalyptic number.

It is an amenable number.

1263997 is a deficient number, since it is larger than the sum of its proper divisors (208259).

1263997 is an equidigital number, since it uses as much as digits as its factorization.

1263997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467.

The product of its digits is 20412, while the sum is 37.

The square root of 1263997 is about 1124.2762116135. The cubic root of 1263997 is about 108.1223179751.

It can be divided in two parts, 12 and 63997, that added together give a square (64009 = 253²).

The spelling of 1263997 in words is "one million, two hundred sixty-three thousand, nine hundred ninety-seven".