16638345 has 32 divisors (see below), whose sum is σ = 30387840. Its totient is φ = 8631360.

The previous prime is 16638331. The next prime is 16638371. The reversal of 16638345 is 54383661.

16638345 is a `hidden beast` number, since 16 + 638 + 3 + 4 + 5 = 666.

It is not a de Polignac number, because 16638345 - 2⁷ = 16638217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3330 + ... + 6660.

It is an arithmetic number, because the mean of its divisors is an integer number (949620).

Almost surely, 2^16638345 is an apocalyptic number.

16638345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16638345 is a deficient number, since it is larger than the sum of its proper divisors (13749495).

16638345 is a wasteful number, since it uses less digits than its factorization.

16638345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382 (or 3376 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 16638345 is about 4079.0127482027. The cubic root of 16638345 is about 255.2917076957.

The spelling of 16638345 in words is "sixteen million, six hundred thirty-eight thousand, three hundred forty-five".