190638743 has 6 divisors (see below), whose sum is σ = 198996504. Its totient is φ = 182286764.

The previous prime is 190638739. The next prime is 190638757. The reversal of 190638743 is 347836091.

It is not a de Polignac number, because 190638743 - 2² = 190638739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 190638743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190638703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64778 + ... + 67656.

It is an arithmetic number, because the mean of its divisors is an integer number (33166084).

Almost surely, 2^190638743 is an apocalyptic number.

190638743 is a deficient number, since it is larger than the sum of its proper divisors (8357761).

190638743 is an frugal number, since it uses more digits than its factorization.

190638743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781 (or 2902 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 190638743 is about 13807.1989556173. The cubic root of 190638743 is about 575.5332097382.

The spelling of 190638743 in words is "one hundred ninety million, six hundred thirty-eight thousand, seven hundred forty-three".