258138815 has 16 divisors (see below), whose sum is σ = 338355360. Its totient is φ = 187499520.

The previous prime is 258138809. The next prime is 258138817. The reversal of 258138815 is 518831852.

It is not a de Polignac number, because 258138815 - 2²⁴ = 241361599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258138817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49031 + ... + 54039.

It is an arithmetic number, because the mean of its divisors is an integer number (21147210).

Almost surely, 2^258138815 is an apocalyptic number.

258138815 is a deficient number, since it is larger than the sum of its proper divisors (80216545).

258138815 is a wasteful number, since it uses less digits than its factorization.

258138815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5962.

The product of its digits is 76800, while the sum is 41.

The square root of 258138815 is about 16066.6989453341. The cubic root of 258138815 is about 636.7238299536.

The spelling of 258138815 in words is "two hundred fifty-eight million, one hundred thirty-eight thousand, eight hundred fifteen".