127021705 has 8 divisors (see below), whose sum is σ = 161392392. Its totient is φ = 95639808.

The previous prime is 127021681. The next prime is 127021723. The reversal of 127021705 is 507120721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69822736 + 57198969 = 8356^2 + 7563^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127021705 - 2⁵ = 127021673 is a prime.

It is a super-2 number, since 2×127021705² = 32269027082214050, which contains 22 as substring.

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 127021705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747102 + ... + 747271.

It is an arithmetic number, because the mean of its divisors is an integer number (20174049).

Almost surely, 2^127021705 is an apocalyptic number.

It is an amenable number.

127021705 is a deficient number, since it is larger than the sum of its proper divisors (34370687).

127021705 is a wasteful number, since it uses less digits than its factorization.

127021705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494395.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 127021705 is about 11270.3906320943. The cubic root of 127021705 is about 502.6812032651.

The spelling of 127021705 in words is "one hundred twenty-seven million, twenty-one thousand, seven hundred five".