258423729 has 4 divisors (see below), whose sum is σ = 344564976. Its totient is φ = 172282484.

The previous prime is 258423713. The next prime is 258423733. The reversal of 258423729 is 927324852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 258423729 - 2⁴ = 258423713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (258423709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43070619 + ... + 43070624.

It is an arithmetic number, because the mean of its divisors is an integer number (86141244).

Almost surely, 2^258423729 is an apocalyptic number.

It is an amenable number.

258423729 is a deficient number, since it is larger than the sum of its proper divisors (86141247).

258423729 is an equidigital number, since it uses as much as digits as its factorization.

258423729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86141246.

The product of its digits is 241920, while the sum is 42.

The square root of 258423729 is about 16075.5631005573. The cubic root of 258423729 is about 636.9579996082.

The spelling of 258423729 in words is "two hundred fifty-eight million, four hundred twenty-three thousand, seven hundred twenty-nine".