12158998 has 4 divisors (see below), whose sum is σ = 18238500. Its totient is φ = 6079498.

The previous prime is 12158989. The next prime is 12158999. The reversal of 12158998 is 89985121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12158999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3039748 + ... + 3039751.

It is an arithmetic number, because the mean of its divisors is an integer number (4559625).

Almost surely, 2^12158998 is an apocalyptic number.

12158998 is a deficient number, since it is larger than the sum of its proper divisors (6079502).

12158998 is an equidigital number, since it uses as much as digits as its factorization.

12158998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6079501.

The product of its digits is 51840, while the sum is 43.

The square root of 12158998 is about 3486.9754802694. The cubic root of 12158998 is about 229.9495667618.

The spelling of 12158998 in words is "twelve million, one hundred fifty-eight thousand, nine hundred ninety-eight".