18542949 has 16 divisors (see below), whose sum is σ = 25240512. Its totient is φ = 12106368.

The previous prime is 18542939. The next prime is 18542969. The reversal of 18542949 is 94924581.

It is not a de Polignac number, because 18542949 - 2⁹ = 18542437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18542949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18542939) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 49527 + ... + 49899.

It is an arithmetic number, because the mean of its divisors is an integer number (1577532).

Almost surely, 2^18542949 is an apocalyptic number.

It is an amenable number.

18542949 is a deficient number, since it is larger than the sum of its proper divisors (6697563).

18542949 is a wasteful number, since it uses less digits than its factorization.

18542949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 103680, while the sum is 42.

The square root of 18542949 is about 4306.1524589824. The cubic root of 18542949 is about 264.6831337865.

It can be divided in two parts, 18542 and 949, that added together give a palindrome (19491).

The spelling of 18542949 in words is "eighteen million, five hundred forty-two thousand, nine hundred forty-nine".