209673389 has 2 divisors, whose sum is σ = 209673390. Its totient is φ = 209673388.

The previous prime is 209673383. The next prime is 209673407. The reversal of 209673389 is 983376902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208369225 + 1304164 = 14435^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 209673389 - 2²⁰ = 208624813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209673383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104836694 + 104836695.

It is an arithmetic number, because the mean of its divisors is an integer number (104836695).

Almost surely, 2^209673389 is an apocalyptic number.

It is an amenable number.

209673389 is a deficient number, since it is larger than the sum of its proper divisors (1).

209673389 is an equidigital number, since it uses as much as digits as its factorization.

209673389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 209673389 is about 14480.1032109581. The cubic root of 209673389 is about 594.0838845433.

The spelling of 209673389 in words is "two hundred nine million, six hundred seventy-three thousand, three hundred eighty-nine".