2659987 has 4 divisors (see below), whose sum is σ = 2901816. Its totient is φ = 2418160.

The previous prime is 2659963. The next prime is 2659999. The reversal of 2659987 is 7899562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2659987 - 2⁷ = 2659859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2659187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120898 + ... + 120919.

It is an arithmetic number, because the mean of its divisors is an integer number (725454).

2^2659987 is an apocalyptic number.

2659987 is a deficient number, since it is larger than the sum of its proper divisors (241829).

2659987 is a wasteful number, since it uses less digits than its factorization.

2659987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241828.

The product of its digits is 272160, while the sum is 46.

The square root of 2659987 is about 1630.9466576194. The cubic root of 2659987 is about 138.5563725044.

The spelling of 2659987 in words is "two million, six hundred fifty-nine thousand, nine hundred eighty-seven".