2651987 has 4 divisors (see below), whose sum is σ = 2856000. Its totient is φ = 2447976.

The previous prime is 2651959. The next prime is 2651989. The reversal of 2651987 is 7891562.

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 2651987 - 2¹² = 2647891 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2651987.

It is not an unprimeable number, because it can be changed into a prime (2651989) 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, 101987 + ... + 102012.

It is an arithmetic number, because the mean of its divisors is an integer number (714000).

2^2651987 is an apocalyptic number.

2651987 is a deficient number, since it is larger than the sum of its proper divisors (204013).

2651987 is a wasteful number, since it uses less digits than its factorization.

2651987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204012.

The product of its digits is 30240, while the sum is 38.

The square root of 2651987 is about 1628.4922474485. The cubic root of 2651987 is about 138.4173287077.

The spelling of 2651987 in words is "two million, six hundred fifty-one thousand, nine hundred eighty-seven".