16542493 has 4 divisors (see below), whose sum is σ = 18046368. Its totient is φ = 15038620.

The previous prime is 16542473. The next prime is 16542509. The reversal of 16542493 is 39424561.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39424561 = 11 ⋅3584051.

It is a cyclic number.

It is not a de Polignac number, because 16542493 - 2⁹ = 16541981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16542403) 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, 751921 + ... + 751942.

It is an arithmetic number, because the mean of its divisors is an integer number (4511592).

Almost surely, 2^16542493 is an apocalyptic number.

It is an amenable number.

16542493 is a deficient number, since it is larger than the sum of its proper divisors (1503875).

16542493 is a wasteful number, since it uses less digits than its factorization.

16542493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503874.

The product of its digits is 25920, while the sum is 34.

The square root of 16542493 is about 4067.2463657861. The cubic root of 16542493 is about 254.8005257907.

The spelling of 16542493 in words is "sixteen million, five hundred forty-two thousand, four hundred ninety-three".