16553939 has 4 divisors (see below), whose sum is σ = 16705920. Its totient is φ = 16401960.

The previous prime is 16553893. The next prime is 16553941. The reversal of 16553939 is 93935561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93935561 = 181 ⋅518981.

It is a cyclic number.

It is not a de Polignac number, because 16553939 - 2⁸ = 16553683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16553896 and 16553905.

It is not an unprimeable number, because it can be changed into a prime (16553989) 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, 75827 + ... + 76044.

It is an arithmetic number, because the mean of its divisors is an integer number (4176480).

Almost surely, 2^16553939 is an apocalyptic number.

16553939 is a deficient number, since it is larger than the sum of its proper divisors (151981).

16553939 is a wasteful number, since it uses less digits than its factorization.

16553939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151980.

The product of its digits is 109350, while the sum is 41.

The square root of 16553939 is about 4068.6532169749. The cubic root of 16553939 is about 254.8592790155.

The spelling of 16553939 in words is "sixteen million, five hundred fifty-three thousand, nine hundred thirty-nine".