899942389 has 2 divisors, whose sum is σ = 899942390. Its totient is φ = 899942388.

The previous prime is 899942383. The next prime is 899942401. The reversal of 899942389 is 983249998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648466225 + 251476164 = 25465^2 + 15858^2 .

It is a cyclic number.

It is not a de Polignac number, because 899942389 - 2⁹ = 899941877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899942383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449971194 + 449971195.

It is an arithmetic number, because the mean of its divisors is an integer number (449971195).

Almost surely, 2^899942389 is an apocalyptic number.

It is an amenable number.

899942389 is a deficient number, since it is larger than the sum of its proper divisors (1).

899942389 is an equidigital number, since it uses as much as digits as its factorization.

899942389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 61.

The square root of 899942389 is about 29999.0398013003. The cubic root of 899942389 is about 965.4687831257.

The spelling of 899942389 in words is "eight hundred ninety-nine million, nine hundred forty-two thousand, three hundred eighty-nine".