1639136044 has 36 divisors (see below), whose sum is σ = 3593496144. Its totient is φ = 648448416.

The previous prime is 1639136027. The next prime is 1639136047. The reversal of 1639136044 is 4406319361.

It is a junction number, because it is equal to n+sod(n) for n = 1639135994 and 1639136012.

It is not an unprimeable number, because it can be changed into a prime (1639136047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319104 + ... + 324199.

Almost surely, 2^1639136044 is an apocalyptic number.

1639136044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1639136044 is an abundant number, since it is smaller than the sum of its proper divisors (1954360100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639136044 is a wasteful number, since it uses less digits than its factorization.

1639136044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643334 (or 643325 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 1639136044 is about 40486.2451210285. The cubic root of 1639136044 is about 1179.0665901979.

The spelling of 1639136044 in words is "one billion, six hundred thirty-nine million, one hundred thirty-six thousand, forty-four".