157744189 has 4 divisors (see below), whose sum is σ = 164602656. Its totient is φ = 150885724.

The previous prime is 157744163. The next prime is 157744193. The reversal of 157744189 is 981447751.

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, and also an emirpimes, since its reverse is a distinct semiprime: 981447751 = 991 ⋅990361.

It is a cyclic number.

It is not a de Polignac number, because 157744189 - 2⁵ = 157744157 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 (157744159) 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, 3429199 + ... + 3429244.

It is an arithmetic number, because the mean of its divisors is an integer number (41150664).

Almost surely, 2^157744189 is an apocalyptic number.

It is an amenable number.

157744189 is a deficient number, since it is larger than the sum of its proper divisors (6858467).

157744189 is an equidigital number, since it uses as much as digits as its factorization.

157744189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858466.

The product of its digits is 282240, while the sum is 46.

The square root of 157744189 is about 12559.6253526927. The cubic root of 157744189 is about 540.3200994240.

The spelling of 157744189 in words is "one hundred fifty-seven million, seven hundred forty-four thousand, one hundred eighty-nine".