1826381 has 4 divisors (see below), whose sum is σ = 1838172. Its totient is φ = 1814592.

The previous prime is 1826371. The next prime is 1826389. The reversal of 1826381 is 1836281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1836281 = 101 ⋅18181.

It can be written as a sum of positive squares in 2 ways, for example, as 885481 + 940900 = 941^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1826381 - 2¹⁰ = 1825357 is a prime.

It is a super-2 number, since 2×1826381² = 6671335114322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1826389) 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, 5660 + ... + 5973.

It is an arithmetic number, because the mean of its divisors is an integer number (459543).

2^1826381 is an apocalyptic number.

It is an amenable number.

1826381 is a deficient number, since it is larger than the sum of its proper divisors (11791).

1826381 is a wasteful number, since it uses less digits than its factorization.

1826381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790.

The product of its digits is 2304, while the sum is 29.

The square root of 1826381 is about 1351.4366429841. The cubic root of 1826381 is about 122.2354362511.

The spelling of 1826381 in words is "one million, eight hundred twenty-six thousand, three hundred eighty-one".