127929997 has 6 divisors (see below), whose sum is σ = 137814698. Its totient is φ = 118051584.

The previous prime is 127929973. The next prime is 127930007. The reversal of 127929997 is 799929721.

It can be written as a sum of positive squares in 3 ways, for example, as 84290761 + 43639236 = 9181^2 + 6606^2 .

It is not a de Polignac number, because 127929997 - 2¹⁹ = 127405709 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 (127929937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39213 + ... + 42349.

Almost surely, 2^127929997 is an apocalyptic number.

It is an amenable number.

127929997 is a deficient number, since it is larger than the sum of its proper divisors (9884701).

127929997 is an frugal number, since it uses more digits than its factorization.

127929997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6287 (or 3150 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 55.

The square root of 127929997 is about 11310.6143511305. The cubic root of 127929997 is about 503.8765300240.

The spelling of 127929997 in words is "one hundred twenty-seven million, nine hundred twenty-nine thousand, nine hundred ninety-seven".