145978189 has 4 divisors (see below), whose sum is σ = 166832224. Its totient is φ = 125124156.

The previous prime is 145978187. The next prime is 145978211. The reversal of 145978189 is 981879541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981879541 = 2539 ⋅386719.

It is a cyclic number.

It is not a de Polignac number, because 145978189 - 2¹ = 145978187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145978181) 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, 10427007 + ... + 10427020.

It is an arithmetic number, because the mean of its divisors is an integer number (41708056).

Almost surely, 2^145978189 is an apocalyptic number.

It is an amenable number.

145978189 is a deficient number, since it is larger than the sum of its proper divisors (20854035).

145978189 is an equidigital number, since it uses as much as digits as its factorization.

145978189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20854034.

The product of its digits is 725760, while the sum is 52.

The square root of 145978189 is about 12082.1433942823. The cubic root of 145978189 is about 526.5375203200.

The spelling of 145978189 in words is "one hundred forty-five million, nine hundred seventy-eight thousand, one hundred eighty-nine".