18421552 has 20 divisors (see below), whose sum is σ = 35787640. Its totient is φ = 9186048.

The previous prime is 18421549. The next prime is 18421553. The reversal of 18421552 is 25512481.

It is a self number, because there is not a number n which added to its sum of digits gives 18421552.

It is not an unprimeable number, because it can be changed into a prime (18421553) 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, 5599 + ... + 8257.

It is an arithmetic number, because the mean of its divisors is an integer number (1789382).

Almost surely, 2^18421552 is an apocalyptic number.

It is an amenable number.

18421552 is a deficient number, since it is larger than the sum of its proper divisors (17366088).

18421552 is a wasteful number, since it uses less digits than its factorization.

18421552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100 (or 3094 counting only the distinct ones).

The product of its digits is 3200, while the sum is 28.

The square root of 18421552 is about 4292.0335506610. The cubic root of 18421552 is about 264.1042594018.

It can be divided in two parts, 184 and 21552, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 18421552 in words is "eighteen million, four hundred twenty-one thousand, five hundred fifty-two".