19618368 has 112 divisors (see below), whose sum is σ = 64763904. Its totient is φ = 5091840.

The previous prime is 19618351. The next prime is 19618369. The reversal of 19618368 is 86381691.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (19618369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14121 + ... + 15447.

Almost surely, 2^19618368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19618368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32381952).

19618368 is an abundant number, since it is smaller than the sum of its proper divisors (45145536).

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

19618368 is a wasteful number, since it uses less digits than its factorization.

19618368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1350 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 19618368 is about 4429.2626925934. The cubic root of 19618368 is about 269.7041478180.

It can be divided in two parts, 196183 and 68, that added together give a triangular number (196251 = T₆₂₆).

The spelling of 19618368 in words is "nineteen million, six hundred eighteen thousand, three hundred sixty-eight".