127540397 has 4 divisors (see below), whose sum is σ = 127581180. Its totient is φ = 127499616.

The previous prime is 127540393. The next prime is 127540429. The reversal of 127540397 is 793045721.

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 112126921 + 15413476 = 10589^2 + 3926^2 .

It is a cyclic number.

It is not a de Polignac number, because 127540397 - 2² = 127540393 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 127540397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127540393) 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, 15272 + ... + 22097.

It is an arithmetic number, because the mean of its divisors is an integer number (31895295).

Almost surely, 2^127540397 is an apocalyptic number.

It is an amenable number.

127540397 is a deficient number, since it is larger than the sum of its proper divisors (40783).

127540397 is an equidigital number, since it uses as much as digits as its factorization.

127540397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40782.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 127540397 is about 11293.3784581940. The cubic root of 127540397 is about 503.3645054253.

It can be divided in two parts, 1275 and 40397, that multiplied together give a triangular number (51506175 = T₁₀₁₄₉).

The spelling of 127540397 in words is "one hundred twenty-seven million, five hundred forty thousand, three hundred ninety-seven".