4491432639 has 8 divisors (see below), whose sum is σ = 6653974320. Its totient is φ = 2994288408.

The previous prime is 4491432619. The next prime is 4491432653. The reversal of 4491432639 is 9362341944.

4491432639 is a `hidden beast` number, since 4 + 4 + 9 + 1 + 4 + 3 + 2 + 639 = 666.

It is not a de Polignac number, because 4491432639 - 2¹⁹ = 4490908351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4491432594 and 4491432603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4491432619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83174652 + ... + 83174705.

It is an arithmetic number, because the mean of its divisors is an integer number (831746790).

Almost surely, 2^4491432639 is an apocalyptic number.

4491432639 is a deficient number, since it is larger than the sum of its proper divisors (2162541681).

4491432639 is a wasteful number, since it uses less digits than its factorization.

4491432639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166349366 (or 166349360 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 4491432639 is about 67018.1515635876. The cubic root of 4491432639 is about 1649.9152253965.

The spelling of 4491432639 in words is "four billion, four hundred ninety-one million, four hundred thirty-two thousand, six hundred thirty-nine".