1999640127 has 16 divisors (see below), whose sum is σ = 2719277568. Its totient is φ = 1306599840.

The previous prime is 1999640057. The next prime is 1999640129. The reversal of 1999640127 is 7210469991.

It is not a de Polignac number, because 1999640127 - 2¹¹ = 1999638079 is a prime.

It is a super-2 number, since 2×1999640127² = 7997121275017152258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999640129) 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 15 ways as a sum of consecutive naturals, for example, 163102 + ... + 174932.

It is an arithmetic number, because the mean of its divisors is an integer number (169954848).

Almost surely, 2^1999640127 is an apocalyptic number.

1999640127 is a deficient number, since it is larger than the sum of its proper divisors (719637441).

1999640127 is a wasteful number, since it uses less digits than its factorization.

1999640127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12950.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 1999640127 is about 44717.3358665294. The cubic root of 1999640127 is about 1259.8454767672.

The spelling of 1999640127 in words is "one billion, nine hundred ninety-nine million, six hundred forty thousand, one hundred twenty-seven".