16381516 has 12 divisors (see below), whose sum is σ = 29592640. Its totient is φ = 7926480.

The previous prime is 16381513. The next prime is 16381577. The reversal of 16381516 is 61518361.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (16381513) 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, 65931 + ... + 66178.

Almost surely, 2^16381516 is an apocalyptic number.

It is an amenable number.

16381516 is a deficient number, since it is larger than the sum of its proper divisors (13211124).

16381516 is a wasteful number, since it uses less digits than its factorization.

16381516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132144 (or 132142 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 16381516 is about 4047.4085536303. The cubic root of 16381516 is about 253.9713320405.

Adding to 16381516 its reverse (61518361), we get a palindrome (77899877).

The spelling of 16381516 in words is "sixteen million, three hundred eighty-one thousand, five hundred sixteen".