188989321 has 4 divisors (see below), whose sum is σ = 197206272. Its totient is φ = 180772372.

The previous prime is 188989309. The next prime is 188989327. The reversal of 188989321 is 123989881.

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: 123989881 = 61 ⋅2032621.

It is a cyclic number.

It is not a de Polignac number, because 188989321 - 2⁷ = 188989193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188989327) 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, 4108441 + ... + 4108486.

It is an arithmetic number, because the mean of its divisors is an integer number (49301568).

Almost surely, 2^188989321 is an apocalyptic number.

It is an amenable number.

188989321 is a deficient number, since it is larger than the sum of its proper divisors (8216951).

188989321 is an equidigital number, since it uses as much as digits as its factorization.

188989321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8216950.

The product of its digits is 248832, while the sum is 49.

The square root of 188989321 is about 13747.3386879061. The cubic root of 188989321 is about 573.8685460609.

The spelling of 188989321 in words is "one hundred eighty-eight million, nine hundred eighty-nine thousand, three hundred twenty-one".