19650144 has 48 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 6464640.

The previous prime is 19650143. The next prime is 19650157. The reversal of 19650144 is 44105691.

It is a happy number.

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

It is a super-2 number, since 2×19650144² = 772256318441472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19650143) 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, 6289 + ... + 8879.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^19650144 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 19650144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

19650144 is an abundant number, since it is smaller than the sum of its proper divisors (32604576).

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

19650144 is a wasteful number, since it uses less digits than its factorization.

19650144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 19650144 is about 4432.8482942686. The cubic root of 19650144 is about 269.8496831336.

The spelling of 19650144 in words is "nineteen million, six hundred fifty thousand, one hundred forty-four".