16538813 has 8 divisors (see below), whose sum is σ = 16800576. Its totient is φ = 16279200.

The previous prime is 16538801. The next prime is 16538827. The reversal of 16538813 is 31883561.

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 16538813 - 2¹⁸ = 16276669 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 (16538713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21353 + ... + 22113.

It is an arithmetic number, because the mean of its divisors is an integer number (2100072).

Almost surely, 2^16538813 is an apocalyptic number.

It is an amenable number.

16538813 is a deficient number, since it is larger than the sum of its proper divisors (261763).

16538813 is a wasteful number, since it uses less digits than its factorization.

16538813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its digits is 17280, while the sum is 35.

The square root of 16538813 is about 4066.7939460956. The cubic root of 16538813 is about 254.7816303019.

The spelling of 16538813 in words is "sixteen million, five hundred thirty-eight thousand, eight hundred thirteen".