127720447 has 4 divisors (see below), whose sum is σ = 128172040. Its totient is φ = 127268856.

The previous prime is 127720421. The next prime is 127720477. The reversal of 127720447 is 744027721.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127720447 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 (127720477) 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, 225372 + ... + 225937.

It is an arithmetic number, because the mean of its divisors is an integer number (32043010).

Almost surely, 2^127720447 is an apocalyptic number.

127720447 is a deficient number, since it is larger than the sum of its proper divisors (451593).

127720447 is an equidigital number, since it uses as much as digits as its factorization.

127720447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451592.

The product of its (nonzero) digits is 21952, while the sum is 34.

The square root of 127720447 is about 11301.3471320901. The cubic root of 127720447 is about 503.6012622141.

The spelling of 127720447 in words is "one hundred twenty-seven million, seven hundred twenty thousand, four hundred forty-seven".