18471842 has 4 divisors (see below), whose sum is σ = 27707766. Its totient is φ = 9235920.

The previous prime is 18471821. The next prime is 18471863. The reversal of 18471842 is 24817481.

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

It is an interprime number because it is at equal distance from previous prime (18471821) and next prime (18471863).

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 9114361 = 3059^2 + 3019^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4617959 + ... + 4617962.

Almost surely, 2^18471842 is an apocalyptic number.

18471842 is a deficient number, since it is larger than the sum of its proper divisors (9235924).

18471842 is an equidigital number, since it uses as much as digits as its factorization.

18471842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9235923.

The product of its digits is 14336, while the sum is 35.

The square root of 18471842 is about 4297.8880860255. Note that the first 3 decimals coincide. The cubic root of 18471842 is about 264.3443719118.

The spelling of 18471842 in words is "eighteen million, four hundred seventy-one thousand, eight hundred forty-two".