189023279 has 2 divisors, whose sum is σ = 189023280. Its totient is φ = 189023278.

The previous prime is 189023251. The next prime is 189023291. The reversal of 189023279 is 972320981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (972320981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189023279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189023299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94511639 + 94511640.

It is an arithmetic number, because the mean of its divisors is an integer number (94511640).

Almost surely, 2^189023279 is an apocalyptic number.

189023279 is a deficient number, since it is larger than the sum of its proper divisors (1).

189023279 is an equidigital number, since it uses as much as digits as its factorization.

189023279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 189023279 is about 13748.5737078433. The cubic root of 189023279 is about 573.9029153062.

The spelling of 189023279 in words is "one hundred eighty-nine million, twenty-three thousand, two hundred seventy-nine".