16145905 has 4 divisors (see below), whose sum is σ = 19375092. Its totient is φ = 12916720.

The previous prime is 16145893. The next prime is 16145933. The reversal of 16145905 is 50954161.

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 1774224 + 14371681 = 1332^2 + 3791^2 .

It is not a de Polignac number, because 16145905 - 2⁵ = 16145873 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614586 + ... + 1614595.

It is an arithmetic number, because the mean of its divisors is an integer number (4843773).

Almost surely, 2^16145905 is an apocalyptic number.

It is an amenable number.

16145905 is a deficient number, since it is larger than the sum of its proper divisors (3229187).

16145905 is an equidigital number, since it uses as much as digits as its factorization.

16145905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229186.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 16145905 is about 4018.1967348551. The cubic root of 16145905 is about 252.7478466978.

The spelling of 16145905 in words is "sixteen million, one hundred forty-five thousand, nine hundred five".