2487991 has 8 divisors (see below), whose sum is σ = 2787984. Its totient is φ = 2200320.

The previous prime is 2487983. The next prime is 2488009. The reversal of 2487991 is 1997842.

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 2487991 - 2³ = 2487983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2487931) 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, 2650 + ... + 3463.

It is an arithmetic number, because the mean of its divisors is an integer number (348498).

2^2487991 is an apocalyptic number.

2487991 is a deficient number, since it is larger than the sum of its proper divisors (299993).

2487991 is a wasteful number, since it uses less digits than its factorization.

2487991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6161.

The product of its digits is 36288, while the sum is 40.

The square root of 2487991 is about 1577.3366793427. The cubic root of 2487991 is about 135.5032156570.

The spelling of 2487991 in words is "two million, four hundred eighty-seven thousand, nine hundred ninety-one".