127540391 has 4 divisors (see below), whose sum is σ = 139134984. Its totient is φ = 115945800.

The previous prime is 127540351. The next prime is 127540393. The reversal of 127540391 is 193045721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127540391 - 2¹⁸ = 127278247 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 (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, 5797280 + ... + 5797301.

It is an arithmetic number, because the mean of its divisors is an integer number (34783746).

Almost surely, 2^127540391 is an apocalyptic number.

127540391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

127540391 is a deficient number, since it is larger than the sum of its proper divisors (11594593).

127540391 is a wasteful number, since it uses less digits than its factorization.

127540391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11594592.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 127540391 is about 11293.3781925516. The cubic root of 127540391 is about 503.3644975319.

The spelling of 127540391 in words is "one hundred twenty-seven million, five hundred forty thousand, three hundred ninety-one".