16440493 has 4 divisors (see below), whose sum is σ = 16465248. Its totient is φ = 16415740.

The previous prime is 16440481. The next prime is 16440497. The reversal of 16440493 is 39404461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16440493 - 2²¹ = 14343341 is a prime.

It is a super-3 number, since 3×16440493³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440497) 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, 11353 + ... + 12718.

It is an arithmetic number, because the mean of its divisors is an integer number (4116312).

Almost surely, 2^16440493 is an apocalyptic number.

It is an amenable number.

16440493 is a deficient number, since it is larger than the sum of its proper divisors (24755).

16440493 is an equidigital number, since it uses as much as digits as its factorization.

16440493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24754.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 16440493 is about 4054.6877808285. The cubic root of 16440493 is about 254.2757509127.

The spelling of 16440493 in words is "sixteen million, four hundred forty thousand, four hundred ninety-three".