1258272138 has 8 divisors (see below), whose sum is σ = 2516544288. Its totient is φ = 419424044.

The previous prime is 1258272133. The next prime is 1258272139. The reversal of 1258272138 is 8312728521.

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

1258272138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1258272096 and 1258272105.

It is not an unprimeable number, because it can be changed into a prime (1258272133) 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 3 ways as a sum of consecutive naturals, for example, 104856006 + ... + 104856017.

It is an arithmetic number, because the mean of its divisors is an integer number (314568036).

Almost surely, 2^1258272138 is an apocalyptic number.

1258272138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1258272138 is a wasteful number, since it uses less digits than its factorization.

1258272138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209712028.

The product of its digits is 53760, while the sum is 39.

The square root of 1258272138 is about 35472.1318502286. The cubic root of 1258272138 is about 1079.5883599279.

The spelling of 1258272138 in words is "one billion, two hundred fifty-eight million, two hundred seventy-two thousand, one hundred thirty-eight".