1940381 has 2 divisors, whose sum is σ = 1940382. Its totient is φ = 1940380.

The previous prime is 1940377. The next prime is 1940399. The reversal of 1940381 is 1830491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 8281 = 1390^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940381 - 2² = 1940377 is a prime.

It is a super-2 number, since 2×1940381² = 7530156850322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1940381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970190 + 970191.

It is an arithmetic number, because the mean of its divisors is an integer number (970191).

2^1940381 is an apocalyptic number.

It is an amenable number.

1940381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940381 is an equidigital number, since it uses as much as digits as its factorization.

1940381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1940381 is about 1392.9755920331. The cubic root of 1940381 is about 124.7275345321.

The spelling of 1940381 in words is "one million, nine hundred forty thousand, three hundred eighty-one".