4078381 has 4 divisors (see below), whose sum is σ = 4089052. Its totient is φ = 4067712.

The previous prime is 4078367. The next prime is 4078387. The reversal of 4078381 is 1838704.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1798281 + 2280100 = 1341^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 4078381 - 2⁷ = 4078253 is a prime.

It is a super-2 number, since 2×4078381² = 33266383162322, which contains 22 as substring.

It is an Ulam number.

It is the 2020-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4078387) by changing a digit.

It is a nontrivial repunit in base 2019.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4740 + ... + 5533.

It is an arithmetic number, because the mean of its divisors is an integer number (1022263).

Almost surely, 2^4078381 is an apocalyptic number.

It is an amenable number.

4078381 is a deficient number, since it is larger than the sum of its proper divisors (10671).

4078381 is a wasteful number, since it uses less digits than its factorization.

4078381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10670.

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

The square root of 4078381 is about 2019.5001856895. The cubic root of 4078381 is about 159.7702562066.

The spelling of 4078381 in words is "four million, seventy-eight thousand, three hundred eighty-one".