3987129 has 8 divisors (see below), whose sum is σ = 5628960. Its totient is φ = 2501696.

The previous prime is 3987121. The next prime is 3987149. The reversal of 3987129 is 9217893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3987129 - 2³ = 3987121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3987121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39039 + ... + 39140.

It is an arithmetic number, because the mean of its divisors is an integer number (703620).

Almost surely, 2^3987129 is an apocalyptic number.

It is an amenable number.

3987129 is a deficient number, since it is larger than the sum of its proper divisors (1641831).

3987129 is a wasteful number, since it uses less digits than its factorization.

3987129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78199.

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

The square root of 3987129 is about 1996.7796573483. The cubic root of 3987129 is about 158.5696602583.

The spelling of 3987129 in words is "three million, nine hundred eighty-seven thousand, one hundred twenty-nine".