16540393 has 4 divisors (see below), whose sum is σ = 17410960. Its totient is φ = 15669828.

The previous prime is 16540387. The next prime is 16540397. The reversal of 16540393 is 39304561.

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 16540393 - 2⁵ = 16540361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16540397) 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, 435255 + ... + 435292.

It is an arithmetic number, because the mean of its divisors is an integer number (4352740).

Almost surely, 2^16540393 is an apocalyptic number.

It is an amenable number.

16540393 is a deficient number, since it is larger than the sum of its proper divisors (870567).

16540393 is an equidigital number, since it uses as much as digits as its factorization.

16540393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870566.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 16540393 is about 4066.9881976716. The cubic root of 16540393 is about 254.7897433823.

The spelling of 16540393 in words is "sixteen million, five hundred forty thousand, three hundred ninety-three".