127978573 has 2 divisors, whose sum is σ = 127978574. Its totient is φ = 127978572.

The previous prime is 127978561. The next prime is 127978577. The reversal of 127978573 is 375879721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69272329 + 58706244 = 8323^2 + 7662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127978573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127978577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63989286 + 63989287.

It is an arithmetic number, because the mean of its divisors is an integer number (63989287).

Almost surely, 2^127978573 is an apocalyptic number.

It is an amenable number.

127978573 is a deficient number, since it is larger than the sum of its proper divisors (1).

127978573 is an equidigital number, since it uses as much as digits as its factorization.

127978573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 49.

The square root of 127978573 is about 11312.7615107895. The cubic root of 127978573 is about 503.9402972133.

The spelling of 127978573 in words is "one hundred twenty-seven million, nine hundred seventy-eight thousand, five hundred seventy-three".