16719440 has 20 divisors (see below), whose sum is σ = 38872884. Its totient is φ = 6687744.

The previous prime is 16719427. The next prime is 16719463. The reversal of 16719440 is 4491761.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 3701776 = 3608^2 + 1924^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 16719397 and 16719406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104417 + ... + 104576.

Almost surely, 2^16719440 is an apocalyptic number.

16719440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16719440 is an abundant number, since it is smaller than the sum of its proper divisors (22153444).

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

16719440 is a wasteful number, since it uses less digits than its factorization.

16719440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209006 (or 209000 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 16719440 is about 4088.9411832405. The cubic root of 16719440 is about 255.7057980927.

It can be divided in two parts, 1671 and 9440, that added together give a palindrome (11111).

The spelling of 16719440 in words is "sixteen million, seven hundred nineteen thousand, four hundred forty".