189790399 has 2 divisors, whose sum is σ = 189790400. Its totient is φ = 189790398.

The previous prime is 189790357. The next prime is 189790409. The reversal of 189790399 is 993097981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189790399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189790309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94895199 + 94895200.

It is an arithmetic number, because the mean of its divisors is an integer number (94895200).

Almost surely, 2^189790399 is an apocalyptic number.

189790399 is a deficient number, since it is larger than the sum of its proper divisors (1).

189790399 is an equidigital number, since it uses as much as digits as its factorization.

189790399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 189790399 is about 13776.4436267130. The cubic root of 189790399 is about 574.6782310624.

The spelling of 189790399 in words is "one hundred eighty-nine million, seven hundred ninety thousand, three hundred ninety-nine".