1275427999 has 8 divisors (see below), whose sum is σ = 1319328080. Its totient is φ = 1232024256.

The previous prime is 1275427997. The next prime is 1275428023. The reversal of 1275427999 is 9997245721.

It is a happy number.

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 1275427999 - 2¹ = 1275427997 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 (1275427997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118854 + ... + 129139.

It is an arithmetic number, because the mean of its divisors is an integer number (164916010).

Almost surely, 2^1275427999 is an apocalyptic number.

1275427999 is a deficient number, since it is larger than the sum of its proper divisors (43900081).

1275427999 is a wasteful number, since it uses less digits than its factorization.

1275427999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248169.

The product of its digits is 2857680, while the sum is 55.

The square root of 1275427999 is about 35713.1348245992. The cubic root of 1275427999 is about 1084.4727627328.

The spelling of 1275427999 in words is "one billion, two hundred seventy-five million, four hundred twenty-seven thousand, nine hundred ninety-nine".