189640263 has 8 divisors (see below), whose sum is σ = 253095808. Its totient is φ = 126305784.

The previous prime is 189640261. The next prime is 189640279. The reversal of 189640263 is 362046981.

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

It is not a de Polignac number, because 189640263 - 2¹ = 189640261 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 (189640261) 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, 26545 + ... + 32922.

It is an arithmetic number, because the mean of its divisors is an integer number (31636976).

Almost surely, 2^189640263 is an apocalyptic number.

189640263 is a deficient number, since it is larger than the sum of its proper divisors (63455545).

189640263 is a wasteful number, since it uses less digits than its factorization.

189640263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60533.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 189640263 is about 13770.9935371418. The cubic root of 189640263 is about 574.5266556889.

The spelling of 189640263 in words is "one hundred eighty-nine million, six hundred forty thousand, two hundred sixty-three".