12157858 has 8 divisors (see below), whose sum is σ = 18486828. Its totient is φ = 5995584.

The previous prime is 12157841. The next prime is 12157861. The reversal of 12157858 is 85875121.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 26569 = 3483^2 + 163^2 .

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

It is a super-2 number, since 2×12157858² = 295627022296328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41491 + ... + 41782.

Almost surely, 2^12157858 is an apocalyptic number.

12157858 is a deficient number, since it is larger than the sum of its proper divisors (6328970).

12157858 is an equidigital number, since it uses as much as digits as its factorization.

12157858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83348.

The product of its digits is 22400, while the sum is 37.

The square root of 12157858 is about 3486.8120109923. The cubic root of 12157858 is about 229.9423800211.

The spelling of 12157858 in words is "twelve million, one hundred fifty-seven thousand, eight hundred fifty-eight".