1428172 has 18 divisors (see below), whose sum is σ = 2571828. Its totient is φ = 693792.

The previous prime is 1428169. The next prime is 1428179. The reversal of 1428172 is 2718241.

It is a happy number.

It is a super-3 number, since 3×1428172³ = 8739021293060833344, which contains 333 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1428179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19528 + ... + 19600.

2^1428172 is an apocalyptic number.

It is an amenable number.

1428172 is a deficient number, since it is larger than the sum of its proper divisors (1143656).

1428172 is an equidigital number, since it uses as much as digits as its factorization.

1428172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 142 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 1428172 is about 1195.0615046934. The cubic root of 1428172 is about 112.6142904357.

It can be divided in two parts, 1428 and 172, that added together give a square (1600 = 40²).

The spelling of 1428172 in words is "one million, four hundred twenty-eight thousand, one hundred seventy-two".