19218144 has 48 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 5823360.

The previous prime is 19218137. The next prime is 19218149. The reversal of 19218144 is 44181291.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19218149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8044 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^19218144 is an apocalyptic number.

It is an amenable number.

19218144 is an abundant number, since it is smaller than the sum of its proper divisors (35818656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19218144 is a wasteful number, since it uses less digits than its factorization.

19218144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18223 (or 18215 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 19218144 is about 4383.8503624097. The cubic root of 19218144 is about 267.8575020287.

It can be divided in two parts, 192 and 18144, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 19218144 in words is "nineteen million, two hundred eighteen thousand, one hundred forty-four".