1263889 has 8 divisors (see below), whose sum is σ = 1395360. Its totient is φ = 1135200.

The previous prime is 1263887. The next prime is 1263917. The reversal of 1263889 is 9883621.

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

It is not a de Polignac number, because 1263889 - 2¹ = 1263887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263887) 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, 334 + ... + 1624.

It is an arithmetic number, because the mean of its divisors is an integer number (174420).

2^1263889 is an apocalyptic number.

It is an amenable number.

1263889 is a deficient number, since it is larger than the sum of its proper divisors (131471).

1263889 is a wasteful number, since it uses less digits than its factorization.

1263889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its digits is 20736, while the sum is 37.

The square root of 1263889 is about 1124.2281796860. The cubic root of 1263889 is about 108.1192384469.

The spelling of 1263889 in words is "one million, two hundred sixty-three thousand, eight hundred eighty-nine".