2078381 has 4 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 2073564.

The previous prime is 2078371. The next prime is 2078389. The reversal of 2078381 is 1838702.

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: 1838702 = 2 ⋅919351.

It is a cyclic number.

It is not a de Polignac number, because 2078381 - 2⁶ = 2078317 is a prime.

It is a super-2 number, since 2×2078381² = 8639335162322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078389) 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, 1691 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (520800).

2^2078381 is an apocalyptic number.

It is an amenable number.

2078381 is a deficient number, since it is larger than the sum of its proper divisors (4819).

2078381 is an equidigital number, since it uses as much as digits as its factorization.

2078381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 2078381 is about 1441.6591136604. The cubic root of 2078381 is about 127.6169579110.

The spelling of 2078381 in words is "two million, seventy-eight thousand, three hundred eighty-one".