1990658727 has 48 divisors (see below), whose sum is σ = 3098135040. Its totient is φ = 1262021040.

The previous prime is 1990658723. The next prime is 1990658729. The reversal of 1990658727 is 7278560991.

It is not a de Polignac number, because 1990658727 - 2² = 1990658723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990658723) 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 47 ways as a sum of consecutive naturals, for example, 10422202 + ... + 10422392.

It is an arithmetic number, because the mean of its divisors is an integer number (64544480).

Almost surely, 2^1990658727 is an apocalyptic number.

1990658727 is a deficient number, since it is larger than the sum of its proper divisors (1107476313).

1990658727 is an equidigital number, since it uses as much as digits as its factorization.

1990658727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The square root of 1990658727 is about 44616.7987085582. The cubic root of 1990658727 is about 1257.9564436447.

The spelling of 1990658727 in words is "one billion, nine hundred ninety million, six hundred fifty-eight thousand, seven hundred twenty-seven".