18816413 has 16 divisors (see below), whose sum is σ = 24009216. Its totient is φ = 14318640.

The previous prime is 18816409. The next prime is 18816419. The reversal of 18816413 is 31461881.

It is a happy number.

It is not a de Polignac number, because 18816413 - 2² = 18816409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18816413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18816419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470 + ... + 6152.

It is an arithmetic number, because the mean of its divisors is an integer number (1500576).

Almost surely, 2^18816413 is an apocalyptic number.

It is an amenable number.

18816413 is a deficient number, since it is larger than the sum of its proper divisors (5192803).

18816413 is a wasteful number, since it uses less digits than its factorization.

18816413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744.

The product of its digits is 4608, while the sum is 32.

The square root of 18816413 is about 4337.7889529114. The cubic root of 18816413 is about 265.9779364367.

The spelling of 18816413 in words is "eighteen million, eight hundred sixteen thousand, four hundred thirteen".