16012405 has 4 divisors (see below), whose sum is σ = 19214892. Its totient is φ = 12809920.

The previous prime is 16012391. The next prime is 16012429. The reversal of 16012405 is 50421061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8071281 + 7941124 = 2841^2 + 2818^2 .

It is not a de Polignac number, because 16012405 - 2¹⁵ = 15979637 is a prime.

It is a super-2 number, since 2×16012405² = 512794227768050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1601236 + ... + 1601245.

It is an arithmetic number, because the mean of its divisors is an integer number (4803723).

Almost surely, 2^16012405 is an apocalyptic number.

It is an amenable number.

16012405 is a deficient number, since it is larger than the sum of its proper divisors (3202487).

16012405 is an equidigital number, since it uses as much as digits as its factorization.

16012405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202486.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 16012405 is about 4001.5503245617. The cubic root of 16012405 is about 252.0493153255.

Adding to 16012405 its reverse (50421061), we get a palindrome (66433466).

The spelling of 16012405 in words is "sixteen million, twelve thousand, four hundred five".