1266388 has 18 divisors (see below), whose sum is σ = 2341626. Its totient is φ = 599184.

The previous prime is 1266379. The next prime is 1266389. The reversal of 1266388 is 8836621.

It can be written as a sum of positive squares in only one way, i.e., 1214404 + 51984 = 1102^2 + 228^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006 + ... + 1882.

2^1266388 is an apocalyptic number.

It is an amenable number.

1266388 is a deficient number, since it is larger than the sum of its proper divisors (1075238).

1266388 is a wasteful number, since it uses less digits than its factorization.

1266388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 898 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 1266388 is about 1125.3390600170. The cubic root of 1266388 is about 108.1904504221.

The spelling of 1266388 in words is "one million, two hundred sixty-six thousand, three hundred eighty-eight".