155380189 has 4 divisors (see below), whose sum is σ = 156116800. Its totient is φ = 154643580.

The previous prime is 155380151. The next prime is 155380207. The reversal of 155380189 is 981083551.

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: 981083551 = 7 ⋅140154793.

It is a cyclic number.

It is not a de Polignac number, because 155380189 - 2¹¹ = 155378141 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 (155380109) 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, 367989 + ... + 368410.

It is an arithmetic number, because the mean of its divisors is an integer number (39029200).

Almost surely, 2^155380189 is an apocalyptic number.

It is an amenable number.

155380189 is a deficient number, since it is larger than the sum of its proper divisors (736611).

155380189 is an equidigital number, since it uses as much as digits as its factorization.

155380189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736610.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 155380189 is about 12465.1590042005. The cubic root of 155380189 is about 537.6073716633.

The spelling of 155380189 in words is "one hundred fifty-five million, three hundred eighty thousand, one hundred eighty-nine".