1628389 has 8 divisors (see below), whose sum is σ = 1869120. Its totient is φ = 1389696.

The previous prime is 1628387. The next prime is 1628401. The reversal of 1628389 is 9838261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1628389 - 2¹ = 1628387 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628381) 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 7 ways as a sum of consecutive naturals, for example, 2142 + ... + 2800.

It is an arithmetic number, because the mean of its divisors is an integer number (233640).

2^1628389 is an apocalyptic number.

It is an amenable number.

1628389 is a deficient number, since it is larger than the sum of its proper divisors (240731).

1628389 is an equidigital number, since it uses as much as digits as its factorization.

1628389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019.

The product of its digits is 20736, while the sum is 37.

The square root of 1628389 is about 1276.0834612203. The cubic root of 1628389 is about 117.6484076169.

The spelling of 1628389 in words is "one million, six hundred twenty-eight thousand, three hundred eighty-nine".