127399905 has 32 divisors (see below), whose sum is σ = 226972800. Its totient is φ = 67801536.

The previous prime is 127399889. The next prime is 127399907. The reversal of 127399905 is 509993721.

It is a happy number.

It is not a de Polignac number, because 127399905 - 2⁴ = 127399889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (127399907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99127 + ... + 100403.

It is an arithmetic number, because the mean of its divisors is an integer number (7092900).

Almost surely, 2^127399905 is an apocalyptic number.

127399905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

127399905 is a deficient number, since it is larger than the sum of its proper divisors (99572895).

127399905 is a wasteful number, since it uses less digits than its factorization.

127399905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030 (or 2024 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 127399905 is about 11287.1566392958. The cubic root of 127399905 is about 503.1796106251.

The spelling of 127399905 in words is "one hundred twenty-seven million, three hundred ninety-nine thousand, nine hundred five".