1247872 has 16 divisors (see below), whose sum is σ = 2486250. Its totient is φ = 623872.

The previous prime is 1247867. The next prime is 1247879. The reversal of 1247872 is 2787421.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 46656 = 1096^2 + 216^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1247879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4747 + ... + 5002.

2^1247872 is an apocalyptic number.

It is an amenable number.

1247872 is a deficient number, since it is larger than the sum of its proper divisors (1238378).

1247872 is an frugal number, since it uses more digits than its factorization.

1247872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9763 (or 9751 counting only the distinct ones).

The product of its digits is 6272, while the sum is 31.

The square root of 1247872 is about 1117.0819128426. The cubic root of 1247872 is about 107.6605712868.

The spelling of 1247872 in words is "one million, two hundred forty-seven thousand, eight hundred seventy-two".