154378189 has 4 divisors (see below), whose sum is σ = 176432224. Its totient is φ = 132324156.

The previous prime is 154378187. The next prime is 154378193. The reversal of 154378189 is 981873451.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 154378189 - 2¹ = 154378187 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 (154378187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11027007 + ... + 11027020.

It is an arithmetic number, because the mean of its divisors is an integer number (44108056).

Almost surely, 2^154378189 is an apocalyptic number.

It is an amenable number.

154378189 is a deficient number, since it is larger than the sum of its proper divisors (22054035).

154378189 is an equidigital number, since it uses as much as digits as its factorization.

154378189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22054034.

The product of its digits is 241920, while the sum is 46.

The square root of 154378189 is about 12424.9019714443. The cubic root of 154378189 is about 536.4492560114.

The spelling of 154378189 in words is "one hundred fifty-four million, three hundred seventy-eight thousand, one hundred eighty-nine".