15987487 has 2 divisors, whose sum is σ = 15987488. Its totient is φ = 15987486.

The previous prime is 15987479. The next prime is 15987509. The reversal of 15987487 is 78478951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15987487 - 2³ = 15987479 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 15987487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15987287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7993743 + 7993744.

It is an arithmetic number, because the mean of its divisors is an integer number (7993744).

Almost surely, 2^15987487 is an apocalyptic number.

15987487 is a deficient number, since it is larger than the sum of its proper divisors (1).

15987487 is an equidigital number, since it uses as much as digits as its factorization.

15987487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 49.

The square root of 15987487 is about 3998.4355690695. The cubic root of 15987487 is about 251.9185037135.

The spelling of 15987487 in words is "fifteen million, nine hundred eighty-seven thousand, four hundred eighty-seven".