2066381 has 4 divisors (see below), whose sum is σ = 2075712. Its totient is φ = 2057052.

The previous prime is 2066329. The next prime is 2066399. The reversal of 2066381 is 1836602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1836602 = 2 ⋅918301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2066381 is a prime.

It is a super-2 number, since 2×2066381² = 8539860874322, which contains 22 as substring.

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 2066381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066321) 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, 4325 + ... + 4778.

It is an arithmetic number, because the mean of its divisors is an integer number (518928).

2^2066381 is an apocalyptic number.

It is an amenable number.

2066381 is a deficient number, since it is larger than the sum of its proper divisors (9331).

2066381 is an equidigital number, since it uses as much as digits as its factorization.

2066381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9330.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2066381 is about 1437.4912173645. The cubic root of 2066381 is about 127.3708752974.

The spelling of 2066381 in words is "two million, sixty-six thousand, three hundred eighty-one".