1243688 has 8 divisors (see below), whose sum is σ = 2331930. Its totient is φ = 621840.

The previous prime is 1243673. The next prime is 1243691. The reversal of 1243688 is 8863421.

It can be written as a sum of positive squares in only one way, i.e., 669124 + 574564 = 818^2 + 758^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77723 + ... + 77738.

2^1243688 is an apocalyptic number.

It is an amenable number.

1243688 is a deficient number, since it is larger than the sum of its proper divisors (1088242).

1243688 is a wasteful number, since it uses less digits than its factorization.

1243688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155467 (or 155463 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 1243688 is about 1115.2076039913. The cubic root of 1243688 is about 107.5401112259.

The spelling of 1243688 in words is "one million, two hundred forty-three thousand, six hundred eighty-eight".