16440520 has 16 divisors (see below), whose sum is σ = 36991260. Its totient is φ = 6576192.

The previous prime is 16440497. The next prime is 16440521. The reversal of 16440520 is 2504461.

It can be written as a sum of positive squares in 2 ways, for example, as 15634116 + 806404 = 3954^2 + 898^2 .

It is a super-3 number, since 3×16440520³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16440491 and 16440500.

It is not an unprimeable number, because it can be changed into a prime (16440521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205467 + ... + 205546.

Almost surely, 2^16440520 is an apocalyptic number.

16440520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16440520 is an abundant number, since it is smaller than the sum of its proper divisors (20550740).

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

16440520 is a wasteful number, since it uses less digits than its factorization.

16440520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411024 (or 411020 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 16440520 is about 4054.6911103067. The cubic root of 16440520 is about 254.2758901105.

Adding to 16440520 its reverse (2504461), we get a palindrome (18944981).

The spelling of 16440520 in words is "sixteen million, four hundred forty thousand, five hundred twenty".