289920187 has 2 divisors, whose sum is σ = 289920188. Its totient is φ = 289920186.

The previous prime is 289920181. The next prime is 289920217. The reversal of 289920187 is 781029982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 289920187 - 2³ = 289920179 is a prime.

It is a super-2 number, since 2×289920187² = 168107429660229938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (289920181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144960093 + 144960094.

It is an arithmetic number, because the mean of its divisors is an integer number (144960094).

Almost surely, 2^289920187 is an apocalyptic number.

289920187 is a deficient number, since it is larger than the sum of its proper divisors (1).

289920187 is an equidigital number, since it uses as much as digits as its factorization.

289920187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 289920187 is about 17027.0428142998. The cubic root of 289920187 is about 661.8498661618.

The spelling of 289920187 in words is "two hundred eighty-nine million, nine hundred twenty thousand, one hundred eighty-seven".