145888889 has 4 divisors (see below), whose sum is σ = 147528180. Its totient is φ = 144249600.

The previous prime is 145888843. The next prime is 145888903. The reversal of 145888889 is 988888541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93760489 + 52128400 = 9683^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 145888889 - 2²⁰ = 144840313 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (145888819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819512 + ... + 819689.

It is an arithmetic number, because the mean of its divisors is an integer number (36882045).

Almost surely, 2^145888889 is an apocalyptic number.

It is an amenable number.

145888889 is a deficient number, since it is larger than the sum of its proper divisors (1639291).

145888889 is an equidigital number, since it uses as much as digits as its factorization.

145888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639290.

The product of its digits is 5898240, while the sum is 59.

The square root of 145888889 is about 12078.4472925952. The cubic root of 145888889 is about 526.4301312367.

The spelling of 145888889 in words is "one hundred forty-five million, eight hundred eighty-eight thousand, eight hundred eighty-nine".