16723289 has 6 divisors (see below), whose sum is σ = 18381930. Its totient is φ = 15202880.

The previous prime is 16723283. The next prime is 16723303. The reversal of 16723289 is 98232761.

16723289 = 1228² + 1229² + ... + 1238².

It can be written as a sum of positive squares in only one way, i.e., 13017664 + 3705625 = 3608^2 + 1925^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16723289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16723283) 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, 68984 + ... + 69225.

It is an arithmetic number, because the mean of its divisors is an integer number (3063655).

Almost surely, 2^16723289 is an apocalyptic number.

It is an amenable number.

16723289 is a deficient number, since it is larger than the sum of its proper divisors (1658641).

16723289 is a wasteful number, since it uses less digits than its factorization.

16723289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138231 (or 138220 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 16723289 is about 4089.4118158972. The cubic root of 16723289 is about 255.7254186881.

The spelling of 16723289 in words is "sixteen million, seven hundred twenty-three thousand, two hundred eighty-nine".