16639025 has 12 divisors (see below), whose sum is σ = 22219932. Its totient is φ = 12287040.

The previous prime is 16639019. The next prime is 16639027. The reversal of 16639025 is 52093661.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 784 + 16638241 = 28^2 + 4079^2 .

It is not a de Polignac number, because 16639025 - 2⁶ = 16638961 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16638982 and 16639000.

It is not an unprimeable number, because it can be changed into a prime (16639027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25274 + ... + 25923.

It is an arithmetic number, because the mean of its divisors is an integer number (1851661).

Almost surely, 2^16639025 is an apocalyptic number.

It is an amenable number.

16639025 is a deficient number, since it is larger than the sum of its proper divisors (5580907).

16639025 is a wasteful number, since it uses less digits than its factorization.

16639025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51220 (or 51215 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 16639025 is about 4079.0961008537. The cubic root of 16639025 is about 255.2951855255.

The spelling of 16639025 in words is "sixteen million, six hundred thirty-nine thousand, twenty-five".