899909639 has 2 divisors, whose sum is σ = 899909640. Its totient is φ = 899909638.

The previous prime is 899909627. The next prime is 899909651. The reversal of 899909639 is 936909998.

It is a balanced prime because it is at equal distance from previous prime (899909627) and next prime (899909651).

It is a cyclic number.

It is not a de Polignac number, because 899909639 - 2⁴ = 899909623 is a prime.

It is a super-2 number, since 2×899909639² = 1619674716730220642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899909669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449954819 + 449954820.

It is an arithmetic number, because the mean of its divisors is an integer number (449954820).

Almost surely, 2^899909639 is an apocalyptic number.

899909639 is a deficient number, since it is larger than the sum of its proper divisors (1).

899909639 is an equidigital number, since it uses as much as digits as its factorization.

899909639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8503056, while the sum is 62.

The square root of 899909639 is about 29998.4939455300. The cubic root of 899909639 is about 965.4570714552.

The spelling of 899909639 in words is "eight hundred ninety-nine million, nine hundred nine thousand, six hundred thirty-nine".