16806413 has 4 divisors (see below), whose sum is σ = 18099228. Its totient is φ = 15513600.

The previous prime is 16806403. The next prime is 16806443. The reversal of 16806413 is 31460861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31460861 = 179 ⋅175759.

It can be written as a sum of positive squares in 2 ways, for example, as 5368489 + 11437924 = 2317^2 + 3382^2 .

It is a cyclic number.

It is not a de Polignac number, because 16806413 - 2²² = 12612109 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 (16806403) 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, 646388 + ... + 646413.

It is an arithmetic number, because the mean of its divisors is an integer number (4524807).

Almost surely, 2^16806413 is an apocalyptic number.

16806413 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16806413 is a deficient number, since it is larger than the sum of its proper divisors (1292815).

16806413 is a wasteful number, since it uses less digits than its factorization.

16806413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292814.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16806413 is about 4099.5625376374. The cubic root of 16806413 is about 256.1484175588.

The spelling of 16806413 in words is "sixteen million, eight hundred six thousand, four hundred thirteen".