16478109 has 6 divisors (see below), whose sum is σ = 23801726. Its totient is φ = 10985400.

The previous prime is 16478101. The next prime is 16478129. The reversal of 16478109 is 90187461.

16478109 is a `hidden beast` number, since 1 + 647 + 8 + 1 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 558009 = 3990^2 + 747^2 .

It is not a de Polignac number, because 16478109 - 2³ = 16478101 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 (16478101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 915442 + ... + 915459.

Almost surely, 2^16478109 is an apocalyptic number.

It is an amenable number.

16478109 is a deficient number, since it is larger than the sum of its proper divisors (7323617).

16478109 is a wasteful number, since it uses less digits than its factorization.

16478109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830907 (or 1830904 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 16478109 is about 4059.3237121471. The cubic root of 16478109 is about 254.4695316201.

The spelling of 16478109 in words is "sixteen million, four hundred seventy-eight thousand, one hundred nine".