1428155 has 4 divisors (see below), whose sum is σ = 1713792. Its totient is φ = 1142520.

The previous prime is 1428151. The next prime is 1428157. The reversal of 1428155 is 5518241.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1428155 - 2² = 1428151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142811 + ... + 142820.

It is an arithmetic number, because the mean of its divisors is an integer number (428448).

2^1428155 is an apocalyptic number.

1428155 is a deficient number, since it is larger than the sum of its proper divisors (285637).

1428155 is an equidigital number, since it uses as much as digits as its factorization.

1428155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285636.

The product of its digits is 1600, while the sum is 26.

The square root of 1428155 is about 1195.0543920676. The cubic root of 1428155 is about 112.6138436056.

The spelling of 1428155 in words is "one million, four hundred twenty-eight thousand, one hundred fifty-five".