189720157 has 8 divisors (see below), whose sum is σ = 207087840. Its totient is φ = 172372560.

The previous prime is 189720071. The next prime is 189720163. The reversal of 189720157 is 751027981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189720157 - 2¹⁵ = 189687389 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 (189720197) 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 7 ways as a sum of consecutive naturals, for example, 20319 + ... + 28147.

It is an arithmetic number, because the mean of its divisors is an integer number (25885980).

Almost surely, 2^189720157 is an apocalyptic number.

It is an amenable number.

189720157 is a deficient number, since it is larger than the sum of its proper divisors (17367683).

189720157 is a wasteful number, since it uses less digits than its factorization.

189720157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 189720157 is about 13773.8940390871. The cubic root of 189720157 is about 574.6073255978.

The spelling of 189720157 in words is "one hundred eighty-nine million, seven hundred twenty thousand, one hundred fifty-seven".