12157798 has 4 divisors (see below), whose sum is σ = 18236700. Its totient is φ = 6078898.

The previous prime is 12157787. The next prime is 12157799. The reversal of 12157798 is 89775121.

12157798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89775121 = 2789 ⋅32189.

It is a self number, because there is not a number n which added to its sum of digits gives 12157798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3039448 + ... + 3039451.

It is an arithmetic number, because the mean of its divisors is an integer number (4559175).

Almost surely, 2^12157798 is an apocalyptic number.

12157798 is a deficient number, since it is larger than the sum of its proper divisors (6078902).

12157798 is an equidigital number, since it uses as much as digits as its factorization.

12157798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6078901.

The product of its digits is 35280, while the sum is 40.

The square root of 12157798 is about 3486.8034071338. The cubic root of 12157798 is about 229.9420017591.

The spelling of 12157798 in words is "twelve million, one hundred fifty-seven thousand, seven hundred ninety-eight".