802639939 has 4 divisors (see below), whose sum is σ = 802819360. Its totient is φ = 802460520.

The previous prime is 802639907. The next prime is 802639949. The reversal of 802639939 is 939936208.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 802639939 - 2⁵ = 802639907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 802639892 and 802639901.

It is not an unprimeable number, because it can be changed into a prime (802639949) 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, 82824 + ... + 92005.

It is an arithmetic number, because the mean of its divisors is an integer number (200704840).

Almost surely, 2^802639939 is an apocalyptic number.

802639939 is a deficient number, since it is larger than the sum of its proper divisors (179421).

802639939 is a wasteful number, since it uses less digits than its factorization.

802639939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179420.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 802639939 is about 28330.9007798905. The cubic root of 802639939 is about 929.3377715133.

The spelling of 802639939 in words is "eight hundred two million, six hundred thirty-nine thousand, nine hundred thirty-nine".