1639139 has 4 divisors (see below), whose sum is σ = 1679160. Its totient is φ = 1599120.

The previous prime is 1639097. The next prime is 1639147. The reversal of 1639139 is 9319361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9319361 = 53 ⋅175837.

It is a cyclic number.

It is not a de Polignac number, because 1639139 - 2¹⁶ = 1573603 is a prime.

It is a super-2 number, since 2×1639139² = 5373553322642, which contains 22 as substring.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 19949 + ... + 20030.

It is an arithmetic number, because the mean of its divisors is an integer number (419790).

2^1639139 is an apocalyptic number.

1639139 is a deficient number, since it is larger than the sum of its proper divisors (40021).

1639139 is an equidigital number, since it uses as much as digits as its factorization.

1639139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40020.

The product of its digits is 4374, while the sum is 32.

The square root of 1639139 is about 1280.2886393310. The cubic root of 1639139 is about 117.9067298969.

The spelling of 1639139 in words is "one million, six hundred thirty-nine thousand, one hundred thirty-nine".