189404693 has 2 divisors, whose sum is σ = 189404694. Its totient is φ = 189404692.

The previous prime is 189404687. The next prime is 189404717. The reversal of 189404693 is 396404981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111999889 + 77404804 = 10583^2 + 8798^2 .

It is a cyclic number.

It is not a de Polignac number, because 189404693 - 2²⁶ = 122295829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189404623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94702346 + 94702347.

It is an arithmetic number, because the mean of its divisors is an integer number (94702347).

Almost surely, 2^189404693 is an apocalyptic number.

It is an amenable number.

189404693 is a deficient number, since it is larger than the sum of its proper divisors (1).

189404693 is an equidigital number, since it uses as much as digits as its factorization.

189404693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 189404693 is about 13762.4377564442. The cubic root of 189404693 is about 574.2886659272.

The spelling of 189404693 in words is "one hundred eighty-nine million, four hundred four thousand, six hundred ninety-three".