16280639 has 4 divisors (see below), whose sum is σ = 16293000. Its totient is φ = 16268280.

The previous prime is 16280623. The next prime is 16280657. The reversal of 16280639 is 93608261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93608261 = 37 ⋅2529953.

It is a cyclic number.

It is not a de Polignac number, because 16280639 - 2⁴ = 16280623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16280599 and 16280608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16280689) 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, 3932 + ... + 6929.

It is an arithmetic number, because the mean of its divisors is an integer number (4073250).

Almost surely, 2^16280639 is an apocalyptic number.

16280639 is a deficient number, since it is larger than the sum of its proper divisors (12361).

16280639 is a wasteful number, since it uses less digits than its factorization.

16280639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12360.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 16280639 is about 4034.9273847245. The cubic root of 16280639 is about 253.4489417325.

The spelling of 16280639 in words is "sixteen million, two hundred eighty thousand, six hundred thirty-nine".