189720423 has 12 divisors (see below), whose sum is σ = 281447608. Its totient is φ = 123061680.

The previous prime is 189720413. The next prime is 189720437. The reversal of 189720423 is 324027981.

It is not a de Polignac number, because 189720423 - 2¹² = 189716327 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 (189720413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284533 + ... + 285198.

Almost surely, 2^189720423 is an apocalyptic number.

189720423 is a deficient number, since it is larger than the sum of its proper divisors (91727185).

189720423 is a wasteful number, since it uses less digits than its factorization.

189720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569774 (or 569771 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 189720423 is about 13773.9036950314. The cubic root of 189720423 is about 574.6075941433.

The spelling of 189720423 in words is "one hundred eighty-nine million, seven hundred twenty thousand, four hundred twenty-three".