18990548 has 12 divisors (see below), whose sum is σ = 34678560. Its totient is φ = 9082392.

The previous prime is 18990541. The next prime is 18990599. The reversal of 18990548 is 84509981.

It is a junction number, because it is equal to n+sod(n) for n = 18990499 and 18990508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990541) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 103118 + ... + 103301.

It is an arithmetic number, because the mean of its divisors is an integer number (2889880).

Almost surely, 2^18990548 is an apocalyptic number.

It is an amenable number.

18990548 is a deficient number, since it is larger than the sum of its proper divisors (15688012).

18990548 is a wasteful number, since it uses less digits than its factorization.

18990548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206446 (or 206444 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18990548 is about 4357.8145899063. The cubic root of 18990548 is about 266.7959088793.

The spelling of 18990548 in words is "eighteen million, nine hundred ninety thousand, five hundred forty-eight".