209240889 has 16 divisors (see below), whose sum is σ = 327762624. Its totient is φ = 117057600.

The previous prime is 209240839. The next prime is 209240891. The reversal of 209240889 is 988042902.

209240889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209240889 - 2⁷ = 209240761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209240889.

It is not an unprimeable number, because it can be changed into a prime (209240819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243442 + ... + 244299.

It is an arithmetic number, because the mean of its divisors is an integer number (20485164).

Almost surely, 2^209240889 is an apocalyptic number.

It is an amenable number.

209240889 is a deficient number, since it is larger than the sum of its proper divisors (118521735).

209240889 is a wasteful number, since it uses less digits than its factorization.

209240889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487768.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 209240889 is about 14465.1612158316. The cubic root of 209240889 is about 593.6751247558.

The spelling of 209240889 in words is "two hundred nine million, two hundred forty thousand, eight hundred eighty-nine".