1639012 has 6 divisors (see below), whose sum is σ = 2868278. Its totient is φ = 819504.

The previous prime is 1638991. The next prime is 1639019. The reversal of 1639012 is 2109361.

It can be written as a sum of positive squares in only one way, i.e., 1382976 + 256036 = 1176^2 + 506^2 .

It is a super-2 number, since 2×1639012² = 5372720672288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1639019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204873 + ... + 204880.

2^1639012 is an apocalyptic number.

It is an amenable number.

1639012 is a deficient number, since it is larger than the sum of its proper divisors (1229266).

1639012 is a wasteful number, since it uses less digits than its factorization.

1639012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409757 (or 409755 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1639012 is about 1280.2390401796. The cubic root of 1639012 is about 117.9036846922.

The spelling of 1639012 in words is "one million, six hundred thirty-nine thousand, twelve".