145779889 has 4 divisors (see below), whose sum is σ = 149719924. Its totient is φ = 141839856.

The previous prime is 145779877. The next prime is 145779899. The reversal of 145779889 is 988977541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988977541 = 9227 ⋅107183.

It can be written as a sum of positive squares in 2 ways, for example, as 108472225 + 37307664 = 10415^2 + 6108^2 .

It is a cyclic number.

It is not a de Polignac number, because 145779889 - 2⁵ = 145779857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145779899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969962 + ... + 1970035.

It is an arithmetic number, because the mean of its divisors is an integer number (37429981).

Almost surely, 2^145779889 is an apocalyptic number.

It is an amenable number.

145779889 is a deficient number, since it is larger than the sum of its proper divisors (3940035).

145779889 is an equidigital number, since it uses as much as digits as its factorization.

145779889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940034.

The product of its digits is 5080320, while the sum is 58.

The square root of 145779889 is about 12073.9342800928. The cubic root of 145779889 is about 526.2989922097.

The spelling of 145779889 in words is "one hundred forty-five million, seven hundred seventy-nine thousand, eight hundred eighty-nine".