1639129 has 4 divisors (see below), whose sum is σ = 1655460. Its totient is φ = 1622800.

The previous prime is 1639097. The next prime is 1639147. The reversal of 1639129 is 9219361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1587600 + 51529 = 1260^2 + 227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639129 - 2⁵ = 1639097 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1639129.

It is not an unprimeable number, because it can be changed into a prime (1639159) 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, 8014 + ... + 8215.

It is an arithmetic number, because the mean of its divisors is an integer number (413865).

2^1639129 is an apocalyptic number.

It is an amenable number.

1639129 is a deficient number, since it is larger than the sum of its proper divisors (16331).

1639129 is a wasteful number, since it uses less digits than its factorization.

1639129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16330.

The product of its digits is 2916, while the sum is 31.

The square root of 1639129 is about 1280.2847339557. The cubic root of 1639129 is about 117.9064901227.

The spelling of 1639129 in words is "one million, six hundred thirty-nine thousand, one hundred twenty-nine".