1880381 has 2 divisors, whose sum is σ = 1880382. Its totient is φ = 1880380.

The previous prime is 1880369. The next prime is 1880401. The reversal of 1880381 is 1830881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 3481 = 1370^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 1880381 - 2¹⁰ = 1879357 is a prime.

It is a super-2 number, since 2×1880381² = 7071665410322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1880321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940190 + 940191.

It is an arithmetic number, because the mean of its divisors is an integer number (940191).

2^1880381 is an apocalyptic number.

It is an amenable number.

1880381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1880381 is an equidigital number, since it uses as much as digits as its factorization.

1880381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 1880381 is about 1371.2698494461. The cubic root of 1880381 is about 123.4284527151.

The spelling of 1880381 in words is "one million, eight hundred eighty thousand, three hundred eighty-one".