3129987 has 16 divisors (see below), whose sum is σ = 4815360. Its totient is φ = 1771392.

The previous prime is 3129967. The next prime is 3129991. The reversal of 3129987 is 7899213.

3129987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3129987 - 2⁶ = 3129923 is a prime.

3129987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3129937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1714 + ... + 3032.

It is an arithmetic number, because the mean of its divisors is an integer number (300960).

Almost surely, 2^3129987 is an apocalyptic number.

3129987 is a deficient number, since it is larger than the sum of its proper divisors (1685373).

3129987 is a wasteful number, since it uses less digits than its factorization.

3129987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442.

The product of its digits is 27216, while the sum is 39.

The square root of 3129987 is about 1769.1769272744. The cubic root of 3129987 is about 146.2786166517.

The spelling of 3129987 in words is "three million, one hundred twenty-nine thousand, nine hundred eighty-seven".