16381909 has 4 divisors (see below), whose sum is σ = 16454304. Its totient is φ = 16309516.

The previous prime is 16381891. The next prime is 16381961. The reversal of 16381909 is 90918361.

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.

It is a cyclic number.

It is not a de Polignac number, because 16381909 - 2⁵ = 16381877 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 (16381979) 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, 35857 + ... + 36310.

It is an arithmetic number, because the mean of its divisors is an integer number (4113576).

Almost surely, 2^16381909 is an apocalyptic number.

It is an amenable number.

16381909 is a deficient number, since it is larger than the sum of its proper divisors (72395).

16381909 is an equidigital number, since it uses as much as digits as its factorization.

16381909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72394.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 16381909 is about 4047.4571029228. The cubic root of 16381909 is about 253.9733629867.

The spelling of 16381909 in words is "sixteen million, three hundred eighty-one thousand, nine hundred nine".