208427089 has 24 divisors (see below), whose sum is σ = 246791160. Its totient is φ = 174741504.

The previous prime is 208427083. The next prime is 208427129. The reversal of 208427089 is 980724802.

It can be written as a sum of positive squares in 12 ways, for example, as 1067089 + 207360000 = 1033^2 + 14400^2 .

It is not a de Polignac number, because 208427089 - 2¹⁷ = 208296017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208427083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107997 + ... + 109909.

It is an arithmetic number, because the mean of its divisors is an integer number (10282965).

Almost surely, 2^208427089 is an apocalyptic number.

208427089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

208427089 is a deficient number, since it is larger than the sum of its proper divisors (38364071).

208427089 is a wasteful number, since it uses less digits than its factorization.

208427089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989 (or 1972 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 208427089 is about 14437.0041559875. The cubic root of 208427089 is about 592.9044651192.

The spelling of 208427089 in words is "two hundred eight million, four hundred twenty-seven thousand, eighty-nine".