2221387 has 8 divisors (see below), whose sum is σ = 2550272. Its totient is φ = 1895400.

The previous prime is 2221381. The next prime is 2221391. The reversal of 2221387 is 7831222.

2221387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2221387 - 2³ = 2221379 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 2²⁰ + 2²⁰ + 1 + 3⁸ + 8 + 7⁶ .

It is a Duffinian number.

2221387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2221381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312 + ... + 2482.

It is an arithmetic number, because the mean of its divisors is an integer number (318784).

2^2221387 is an apocalyptic number.

2221387 is a deficient number, since it is larger than the sum of its proper divisors (328885).

2221387 is a wasteful number, since it uses less digits than its factorization.

2221387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449.

The product of its digits is 1344, while the sum is 25.

The square root of 2221387 is about 1490.4318166223. The cubic root of 2221387 is about 130.4792370680.

It can be divided in two parts, 222138 and 7, that multiplied together give a triangular number (1554966 = T₁₇₆₃).

The spelling of 2221387 in words is "two million, two hundred twenty-one thousand, three hundred eighty-seven".