16440557 has 8 divisors (see below), whose sum is σ = 19016256. Its totient is φ = 13921632.

The previous prime is 16440539. The next prime is 16440563. The reversal of 16440557 is 75504461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16440557 - 2¹⁸ = 16178413 is a prime.

It is a super-3 number, since 3×16440557³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13568 + ... + 14729.

It is an arithmetic number, because the mean of its divisors is an integer number (2377032).

Almost surely, 2^16440557 is an apocalyptic number.

It is an amenable number.

16440557 is a deficient number, since it is larger than the sum of its proper divisors (2575699).

16440557 is an equidigital number, since it uses as much as digits as its factorization.

16440557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28387.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 16440557 is about 4054.6956729205. The cubic root of 16440557 is about 254.2760808628.

The spelling of 16440557 in words is "sixteen million, four hundred forty thousand, five hundred fifty-seven".