18449842 has 4 divisors (see below), whose sum is σ = 27674766. Its totient is φ = 9224920.

The previous prime is 18449839. The next prime is 18449861. The reversal of 18449842 is 24894481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24894481 = 401 ⋅62081.

It can be written as a sum of positive squares in only one way, i.e., 17986081 + 463761 = 4241^2 + 681^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18449795 and 18449804.

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 as a sum of consecutive naturals, namely, 4612459 + ... + 4612462.

Almost surely, 2^18449842 is an apocalyptic number.

18449842 is a deficient number, since it is larger than the sum of its proper divisors (9224924).

18449842 is an equidigital number, since it uses as much as digits as its factorization.

18449842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9224923.

The product of its digits is 73728, while the sum is 40.

The square root of 18449842 is about 4295.3279269457. The cubic root of 18449842 is about 264.2393853328.

It can be divided in two parts, 18449 and 842, that added together give a palindrome (19291).

The spelling of 18449842 in words is "eighteen million, four hundred forty-nine thousand, eight hundred forty-two".