157820189 has 4 divisors (see below), whose sum is σ = 157932060. Its totient is φ = 157708320.

The previous prime is 157820147. The next prime is 157820203. The reversal of 157820189 is 981028751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 139476100 = 4283^2 + 11810^2 .

It is a cyclic number.

It is not a de Polignac number, because 157820189 - 2²⁰ = 156771613 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 (157820389) 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, 53792 + ... + 56649.

It is an arithmetic number, because the mean of its divisors is an integer number (39483015).

Almost surely, 2^157820189 is an apocalyptic number.

It is an amenable number.

157820189 is a deficient number, since it is larger than the sum of its proper divisors (111871).

157820189 is a wasteful number, since it uses less digits than its factorization.

157820189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111870.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 157820189 is about 12562.6505563118. The cubic root of 157820189 is about 540.4068595866.

The spelling of 157820189 in words is "one hundred fifty-seven million, eight hundred twenty thousand, one hundred eighty-nine".