16440390 has 48 divisors (see below), whose sum is σ = 44226000. Its totient is φ = 4232256.

The previous prime is 16440379. The next prime is 16440397. The reversal of 16440390 is 9304461.

It is a super-3 number, since 3×16440390³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 540 + ... + 5759.

It is an arithmetic number, because the mean of its divisors is an integer number (921375).

Almost surely, 2^16440390 is an apocalyptic number.

16440390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16440390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22113000).

16440390 is an abundant number, since it is smaller than the sum of its proper divisors (27785610).

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

16440390 is a wasteful number, since it uses less digits than its factorization.

16440390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341 (or 6338 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16440390 is about 4054.6750794607. The cubic root of 16440390 is about 254.2752198974.

The spelling of 16440390 in words is "sixteen million, four hundred forty thousand, three hundred ninety".