1287172 has 24 divisors (see below), whose sum is σ = 2491776. Its totient is φ = 578688.

The previous prime is 1287163. The next prime is 1287173. The reversal of 1287172 is 2717821.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1287172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1153 + ... + 1975.

It is an arithmetic number, because the mean of its divisors is an integer number (103824).

2^1287172 is an apocalyptic number.

It is an amenable number.

1287172 is a deficient number, since it is larger than the sum of its proper divisors (1204604).

1287172 is a wasteful number, since it uses less digits than its factorization.

1287172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 865 counting only the distinct ones).

The product of its digits is 1568, while the sum is 28.

The square root of 1287172 is about 1134.5360285156. The cubic root of 1287172 is about 108.7791167027.

The spelling of 1287172 in words is "one million, two hundred eighty-seven thousand, one hundred seventy-two".