869606399 has 2 divisors, whose sum is σ = 869606400. Its totient is φ = 869606398.

The previous prime is 869606377. The next prime is 869606401. The reversal of 869606399 is 993606968.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869606399 is a prime.

Together with 869606401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869606359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434803199 + 434803200.

It is an arithmetic number, because the mean of its divisors is an integer number (434803200).

Almost surely, 2^869606399 is an apocalyptic number.

869606399 is a deficient number, since it is larger than the sum of its proper divisors (1).

869606399 is an equidigital number, since it uses as much as digits as its factorization.

869606399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The square root of 869606399 is about 29489.0894908609. The cubic root of 869606399 is about 954.4962847122.

The spelling of 869606399 in words is "eight hundred sixty-nine million, six hundred six thousand, three hundred ninety-nine".