16939487 has 2 divisors, whose sum is σ = 16939488. Its totient is φ = 16939486.

The previous prime is 16939457. The next prime is 16939501. The reversal of 16939487 is 78493961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16939487 - 2⁸ = 16939231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16939427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469743 + 8469744.

It is an arithmetic number, because the mean of its divisors is an integer number (8469744).

Almost surely, 2^16939487 is an apocalyptic number.

16939487 is a deficient number, since it is larger than the sum of its proper divisors (1).

16939487 is an equidigital number, since it uses as much as digits as its factorization.

16939487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 16939487 is about 4115.7608045172. The cubic root of 16939487 is about 256.8227062265.

The spelling of 16939487 in words is "sixteen million, nine hundred thirty-nine thousand, four hundred eighty-seven".