1238128215 has 16 divisors (see below), whose sum is σ = 1989512928. Its totient is φ = 657499136.

The previous prime is 1238128201. The next prime is 1238128259. The reversal of 1238128215 is 5128218321.

It is a cyclic number.

It is not a de Polignac number, because 1238128215 - 2⁹ = 1238127703 is a prime.

It is a super-2 number, since 2×1238128215² = 3065922953558172450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173634 + ... + 180623.

It is an arithmetic number, because the mean of its divisors is an integer number (124344558).

Almost surely, 2^1238128215 is an apocalyptic number.

1238128215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1238128215 is a deficient number, since it is larger than the sum of its proper divisors (751384713).

1238128215 is a wasteful number, since it uses less digits than its factorization.

1238128215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354498.

The product of its digits is 7680, while the sum is 33.

The square root of 1238128215 is about 35187.0461249591. The cubic root of 1238128215 is about 1073.7962267152.

The spelling of 1238128215 in words is "one billion, two hundred thirty-eight million, one hundred twenty-eight thousand, two hundred fifteen".