18812899 has 4 divisors (see below), whose sum is σ = 21500464. Its totient is φ = 16125336.

The previous prime is 18812867. The next prime is 18812921. The reversal of 18812899 is 99821881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99821881 = 6529 ⋅15289.

It is a cyclic number.

It is not a de Polignac number, because 18812899 - 2⁵ = 18812867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18812699) 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, 1343772 + ... + 1343785.

It is an arithmetic number, because the mean of its divisors is an integer number (5375116).

Almost surely, 2^18812899 is an apocalyptic number.

18812899 is a deficient number, since it is larger than the sum of its proper divisors (2687565).

18812899 is an equidigital number, since it uses as much as digits as its factorization.

18812899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687564.

The product of its digits is 82944, while the sum is 46.

The square root of 18812899 is about 4337.3838889358. The cubic root of 18812899 is about 265.9613781150.

The spelling of 18812899 in words is "eighteen million, eight hundred twelve thousand, eight hundred ninety-nine".