16440617 has 4 divisors (see below), whose sum is σ = 16884996. Its totient is φ = 15996240.

The previous prime is 16440601. The next prime is 16440623. The reversal of 16440617 is 71604461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71604461 = 1033 ⋅69317.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 885481 = 3944^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 16440617 - 2⁴ = 16440601 is a prime.

It is a super-3 number, since 3×16440617³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16440617.

It is not an unprimeable number, because it can be changed into a prime (16440217) 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, 222134 + ... + 222207.

It is an arithmetic number, because the mean of its divisors is an integer number (4221249).

Almost surely, 2^16440617 is an apocalyptic number.

It is an amenable number.

16440617 is a deficient number, since it is larger than the sum of its proper divisors (444379).

16440617 is an equidigital number, since it uses as much as digits as its factorization.

16440617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444378.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 16440617 is about 4054.7030717427. The cubic root of 16440617 is about 254.2763901902.

The spelling of 16440617 in words is "sixteen million, four hundred forty thousand, six hundred seventeen".