1628143 has 4 divisors (see below), whose sum is σ = 1776168. Its totient is φ = 1480120.

The previous prime is 1628131. The next prime is 1628149. The reversal of 1628143 is 3418261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1628143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73996 + ... + 74017.

It is an arithmetic number, because the mean of its divisors is an integer number (444042).

2^1628143 is an apocalyptic number.

1628143 is a deficient number, since it is larger than the sum of its proper divisors (148025).

1628143 is a wasteful number, since it uses less digits than its factorization.

1628143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148024.

The product of its digits is 1152, while the sum is 25.

The square root of 1628143 is about 1275.9870689000. The cubic root of 1628143 is about 117.6424829544.

It can be divided in two parts, 1628 and 143, that added together give a palindrome (1771).

The spelling of 1628143 in words is "one million, six hundred twenty-eight thousand, one hundred forty-three".