190139993 has 2 divisors, whose sum is σ = 190139994. Its totient is φ = 190139992.

The previous prime is 190139909. The next prime is 190140007. The reversal of 190139993 is 399931091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189557824 + 582169 = 13768^2 + 763^2 .

It is a cyclic number.

It is not a de Polignac number, because 190139993 - 2¹⁰ = 190138969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190139693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95069996 + 95069997.

It is an arithmetic number, because the mean of its divisors is an integer number (95069997).

Almost surely, 2^190139993 is an apocalyptic number.

It is an amenable number.

190139993 is a deficient number, since it is larger than the sum of its proper divisors (1).

190139993 is an equidigital number, since it uses as much as digits as its factorization.

190139993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 44.

The square root of 190139993 is about 13789.1258968798. The cubic root of 190139993 is about 575.0308671520.

The spelling of 190139993 in words is "one hundred ninety million, one hundred thirty-nine thousand, nine hundred ninety-three".