1639109 has 6 divisors (see below), whose sum is σ = 1698450. Its totient is φ = 1581776.

The previous prime is 1639097. The next prime is 1639147. The reversal of 1639109 is 9019361.

It can be written as a sum of positive squares in 3 ways, for example, as 494209 + 1144900 = 703^2 + 1070^2 .

It is not a de Polignac number, because 1639109 - 2¹² = 1635013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 134 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (283075).

2^1639109 is an apocalyptic number.

It is an amenable number.

1639109 is a deficient number, since it is larger than the sum of its proper divisors (59341).

1639109 is an equidigital number, since it uses as much as digits as its factorization.

1639109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1639109 is about 1280.2769231694. The cubic root of 1639109 is about 117.9060105714.

The spelling of 1639109 in words is "one million, six hundred thirty-nine thousand, one hundred nine".