190647389 has 4 divisors (see below), whose sum is σ = 192612924. Its totient is φ = 188681856.

The previous prime is 190647377. The next prime is 190647407. The reversal of 190647389 is 983746091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142802500 + 47844889 = 11950^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 190647389 - 2²⁰ = 189598813 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 (190647329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982622 + ... + 982815.

It is an arithmetic number, because the mean of its divisors is an integer number (48153231).

Almost surely, 2^190647389 is an apocalyptic number.

It is an amenable number.

190647389 is a deficient number, since it is larger than the sum of its proper divisors (1965535).

190647389 is an equidigital number, since it uses as much as digits as its factorization.

190647389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965534.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 190647389 is about 13807.5120496055. The cubic root of 190647389 is about 575.5419102868.

The spelling of 190647389 in words is "one hundred ninety million, six hundred forty-seven thousand, three hundred eighty-nine".