2821387 has 8 divisors (see below), whose sum is σ = 2962080. Its totient is φ = 2682240.

The previous prime is 2821369. The next prime is 2821393. The reversal of 2821387 is 7831282.

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 2821387 - 2¹⁵ = 2788619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2822387) 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, 5289 + ... + 5797.

It is an arithmetic number, because the mean of its divisors is an integer number (370260).

2^2821387 is an apocalyptic number.

2821387 is a deficient number, since it is larger than the sum of its proper divisors (140693).

2821387 is a wasteful number, since it uses less digits than its factorization.

2821387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773.

The product of its digits is 5376, while the sum is 31.

The square root of 2821387 is about 1679.6984848478. The cubic root of 2821387 is about 141.3039233384.

The spelling of 2821387 in words is "two million, eight hundred twenty-one thousand, three hundred eighty-seven".