208906489 has 16 divisors (see below), whose sum is σ = 249094656. Its totient is φ = 172972800.

The previous prime is 208906471. The next prime is 208906531. The reversal of 208906489 is 984609802.

It is not a de Polignac number, because 208906489 - 2¹³ = 208898297 is a prime.

It is a super-2 number, since 2×208906489² = 87283842292614242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208906409) 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, 12222 + ... + 23815.

It is an arithmetic number, because the mean of its divisors is an integer number (15568416).

Almost surely, 2^208906489 is an apocalyptic number.

It is an amenable number.

208906489 is a deficient number, since it is larger than the sum of its proper divisors (40188167).

208906489 is a wasteful number, since it uses less digits than its factorization.

208906489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36096.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 208906489 is about 14453.5977874023. The cubic root of 208906489 is about 593.3586939110.

The spelling of 208906489 in words is "two hundred eight million, nine hundred six thousand, four hundred eighty-nine".