16675405 has 4 divisors (see below), whose sum is σ = 20010492. Its totient is φ = 13340320.

The previous prime is 16675381. The next prime is 16675409. The reversal of 16675405 is 50457661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50457661 = 1949 ⋅25889.

It can be written as a sum of positive squares in 2 ways, for example, as 4418404 + 12257001 = 2102^2 + 3501^2 .

It is not a de Polignac number, because 16675405 - 2⁷ = 16675277 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 (16675409) 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, 1667536 + ... + 1667545.

It is an arithmetic number, because the mean of its divisors is an integer number (5002623).

Almost surely, 2^16675405 is an apocalyptic number.

It is an amenable number.

16675405 is a deficient number, since it is larger than the sum of its proper divisors (3335087).

16675405 is an equidigital number, since it uses as much as digits as its factorization.

16675405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335086.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 16675405 is about 4083.5529872894. The cubic root of 16675405 is about 255.4811114466.

The spelling of 16675405 in words is "sixteen million, six hundred seventy-five thousand, four hundred five".