869999993 has 2 divisors, whose sum is σ = 869999994. Its totient is φ = 869999992.

The previous prime is 869999989. The next prime is 870000049. The reversal of 869999993 is 399999968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578546809 + 291453184 = 24053^2 + 17072^2 .

It is a cyclic number.

It is not a de Polignac number, because 869999993 - 2² = 869999989 is a prime.

It is not a weakly prime, because it can be changed into another prime (869929993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434999996 + 434999997.

It is an arithmetic number, because the mean of its divisors is an integer number (434999997).

Almost surely, 2^869999993 is an apocalyptic number.

It is an amenable number.

869999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

869999993 is an equidigital number, since it uses as much as digits as its factorization.

869999993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76527504, while the sum is 71.

The square root of 869999993 is about 29495.7622888441. The cubic root of 869999993 is about 954.6402683757.

The spelling of 869999993 in words is "eight hundred sixty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".