127983997 has 4 divisors (see below), whose sum is σ = 128843100. Its totient is φ = 127124896.

The previous prime is 127983991. The next prime is 127984009. The reversal of 127983997 is 799389721.

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 51753636 + 76230361 = 7194^2 + 8731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127983997 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 (127983991) 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, 429328 + ... + 429625.

It is an arithmetic number, because the mean of its divisors is an integer number (32210775).

Almost surely, 2^127983997 is an apocalyptic number.

It is an amenable number.

127983997 is a deficient number, since it is larger than the sum of its proper divisors (859103).

127983997 is an equidigital number, since it uses as much as digits as its factorization.

127983997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859102.

The product of its digits is 1714608, while the sum is 55.

The square root of 127983997 is about 11313.0012375143. The cubic root of 127983997 is about 503.9474164612.

The spelling of 127983997 in words is "one hundred twenty-seven million, nine hundred eighty-three thousand, nine hundred ninety-seven".