1286172 has 24 divisors (see below), whose sum is σ = 3334800. Its totient is φ = 428688.

The previous prime is 1286149. The next prime is 1286177. The reversal of 1286172 is 2716821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286177) 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, 5847 + ... + 6062.

It is an arithmetic number, because the mean of its divisors is an integer number (138950).

2^1286172 is an apocalyptic number.

1286172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1286172 is an abundant number, since it is smaller than the sum of its proper divisors (2048628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1286172 is a wasteful number, since it uses less digits than its factorization.

1286172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11922 (or 11914 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1286172 is about 1134.0952340963. The cubic root of 1286172 is about 108.7509393498.

The spelling of 1286172 in words is "one million, two hundred eighty-six thousand, one hundred seventy-two".