2643381 has 32 divisors (see below), whose sum is σ = 4475520. Its totient is φ = 1527552.

The previous prime is 2643353. The next prime is 2643383. The reversal of 2643381 is 1833462.

It is a happy number.

2643381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2643381 - 2⁵ = 2643349 is a prime.

It is a super-2 number, since 2×2643381² = 13974926222322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁹ + 6 + 4³ + 3⁷ + 3⁹ + 8⁷ + 1 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643383) 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 31 ways as a sum of consecutive naturals, for example, 5746 + ... + 6188.

It is an arithmetic number, because the mean of its divisors is an integer number (139860).

2^2643381 is an apocalyptic number.

It is an amenable number.

2643381 is a deficient number, since it is larger than the sum of its proper divisors (1832139).

2643381 is a wasteful number, since it uses less digits than its factorization.

2643381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 476 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2643381 is about 1625.8477788526. The cubic root of 2643381 is about 138.2674397871.

2643381 divided by its sum of digits (27) gives a triangular number (97903 = T₄₄₂).

The spelling of 2643381 in words is "two million, six hundred forty-three thousand, three hundred eighty-one".