839979929 has 2 divisors, whose sum is σ = 839979930. Its totient is φ = 839979928.

The previous prime is 839979923. The next prime is 839979967. The reversal of 839979929 is 929979938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 534534400 + 305445529 = 23120^2 + 17477^2 .

It is a cyclic number.

It is not a de Polignac number, because 839979929 - 2¹² = 839975833 is a prime.

It is a super-2 number, since 2×839979929² = 1411132562245690082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (839979923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419989964 + 419989965.

It is an arithmetic number, because the mean of its divisors is an integer number (419989965).

Almost surely, 2^839979929 is an apocalyptic number.

It is an amenable number.

839979929 is a deficient number, since it is larger than the sum of its proper divisors (1).

839979929 is an equidigital number, since it uses as much as digits as its factorization.

839979929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 65.

The square root of 839979929 is about 28982.4072326644. The cubic root of 839979929 is about 943.5312810165.

Subtracting 839979929 from its reverse (929979938), we obtain a palindrome (90000009).

The spelling of 839979929 in words is "eight hundred thirty-nine million, nine hundred seventy-nine thousand, nine hundred twenty-nine".