898438909 has 2 divisors, whose sum is σ = 898438910. Its totient is φ = 898438908.

The previous prime is 898438873. The next prime is 898438951. The reversal of 898438909 is 909834898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491287225 + 407151684 = 22165^2 + 20178^2 .

It is a cyclic number.

It is not a de Polignac number, because 898438909 - 2¹³ = 898430717 is a prime.

It is a super-2 number, since 2×898438909² = 1614384946410220562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (898438969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449219454 + 449219455.

It is an arithmetic number, because the mean of its divisors is an integer number (449219455).

Almost surely, 2^898438909 is an apocalyptic number.

It is an amenable number.

898438909 is a deficient number, since it is larger than the sum of its proper divisors (1).

898438909 is an equidigital number, since it uses as much as digits as its factorization.

898438909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 58.

The square root of 898438909 is about 29973.9705244400. The cubic root of 898438909 is about 964.9308330964.

The spelling of 898438909 in words is "eight hundred ninety-eight million, four hundred thirty-eight thousand, nine hundred nine".