16405745 has 4 divisors (see below), whose sum is σ = 19686900. Its totient is φ = 13124592.

The previous prime is 16405729. The next prime is 16405751. The reversal of 16405745 is 54750461.

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 10491121 + 5914624 = 3239^2 + 2432^2 .

It is a cyclic number.

It is not a de Polignac number, because 16405745 - 2⁴ = 16405729 is a prime.

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, 1640570 + ... + 1640579.

It is an arithmetic number, because the mean of its divisors is an integer number (4921725).

Almost surely, 2^16405745 is an apocalyptic number.

It is an amenable number.

16405745 is a deficient number, since it is larger than the sum of its proper divisors (3281155).

16405745 is an equidigital number, since it uses as much as digits as its factorization.

16405745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281154.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 16405745 is about 4050.4005974718. The cubic root of 16405745 is about 254.0964820396.

The spelling of 16405745 in words is "sixteen million, four hundred five thousand, seven hundred forty-five".