127689245 has 4 divisors (see below), whose sum is σ = 153227100. Its totient is φ = 102151392.

The previous prime is 127689239. The next prime is 127689251. The reversal of 127689245 is 542986721.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (127689239) and next prime (127689251).

It can be written as a sum of positive squares in 2 ways, for example, as 92891044 + 34798201 = 9638^2 + 5899^2 .

It is a cyclic number.

It is not a de Polignac number, because 127689245 - 2¹⁴ = 127672861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127689196 and 127689205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12768920 + ... + 12768929.

It is an arithmetic number, because the mean of its divisors is an integer number (38306775).

Almost surely, 2^127689245 is an apocalyptic number.

It is an amenable number.

127689245 is a deficient number, since it is larger than the sum of its proper divisors (25537855).

127689245 is an equidigital number, since it uses as much as digits as its factorization.

127689245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25537854.

The product of its digits is 241920, while the sum is 44.

The square root of 127689245 is about 11299.9665928710. The cubic root of 127689245 is about 503.5602490830.

The spelling of 127689245 in words is "one hundred twenty-seven million, six hundred eighty-nine thousand, two hundred forty-five".