188540989 has 8 divisors (see below), whose sum is σ = 232050560. Its totient is φ = 149175216.

The previous prime is 188540987. The next prime is 188540993. The reversal of 188540989 is 989045881.

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 188540989 - 2¹ = 188540987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188540983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1035849 + ... + 1036030.

It is an arithmetic number, because the mean of its divisors is an integer number (29006320).

Almost surely, 2^188540989 is an apocalyptic number.

It is an amenable number.

188540989 is a deficient number, since it is larger than the sum of its proper divisors (43509571).

188540989 is a wasteful number, since it uses less digits than its factorization.

188540989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071899.

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 188540989 is about 13731.0228679440. The cubic root of 188540989 is about 573.4143980908.

The spelling of 188540989 in words is "one hundred eighty-eight million, five hundred forty thousand, nine hundred eighty-nine".