1628129 has 4 divisors (see below), whose sum is σ = 1713840. Its totient is φ = 1542420.

The previous prime is 1628117. The next prime is 1628131. The reversal of 1628129 is 9218261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9218261 = 13 ⋅709097.

It is not a de Polignac number, because 1628129 - 2¹⁶ = 1562593 is a prime.

It is a Duffinian 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, 42827 + ... + 42864.

It is an arithmetic number, because the mean of its divisors is an integer number (428460).

2^1628129 is an apocalyptic number.

1628129 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1628129 is a deficient number, since it is larger than the sum of its proper divisors (85711).

1628129 is an equidigital number, since it uses as much as digits as its factorization.

1628129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85710.

The product of its digits is 1728, while the sum is 29.

The square root of 1628129 is about 1275.9815829392. The cubic root of 1628129 is about 117.6421457605.

It can be divided in two parts, 1628 and 129, that multiplied together give a palindrome (210012).

The spelling of 1628129 in words is "one million, six hundred twenty-eight thousand, one hundred twenty-nine".