16639487 has 2 divisors, whose sum is σ = 16639488. Its totient is φ = 16639486.

The previous prime is 16639451. The next prime is 16639501. The reversal of 16639487 is 78493661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16639487 - 2⁶ = 16639423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16639087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8319743 + 8319744.

It is an arithmetic number, because the mean of its divisors is an integer number (8319744).

Almost surely, 2^16639487 is an apocalyptic number.

16639487 is a deficient number, since it is larger than the sum of its proper divisors (1).

16639487 is an equidigital number, since it uses as much as digits as its factorization.

16639487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 16639487 is about 4079.1527306538. The cubic root of 16639487 is about 255.2975483499.

The spelling of 16639487 in words is "sixteen million, six hundred thirty-nine thousand, four hundred eighty-seven".