19440408 has 48 divisors (see below), whose sum is σ = 52638120. Its totient is φ = 5980416.

The previous prime is 19440397. The next prime is 19440427. The reversal of 19440408 is 80404491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1660 + ... + 6452.

Almost surely, 2^19440408 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 19440408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26319060).

19440408 is an abundant number, since it is smaller than the sum of its proper divisors (33197712).

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

19440408 is a wasteful number, since it uses less digits than its factorization.

19440408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4828 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 19440408 is about 4409.1278049065. The cubic root of 19440408 is about 268.8861658637.

Adding to 19440408 its reverse (80404491), we get a palindrome (99844899).

The spelling of 19440408 in words is "nineteen million, four hundred forty thousand, four hundred eight".