1940401 has 2 divisors, whose sum is σ = 1940402. Its totient is φ = 1940400.

The previous prime is 1940399. The next prime is 1940423. The reversal of 1940401 is 1040491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1498176 + 442225 = 1224^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940401 - 2¹ = 1940399 is a prime.

Together with 1940399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1940201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970200 + 970201.

It is an arithmetic number, because the mean of its divisors is an integer number (970201).

2^1940401 is an apocalyptic number.

It is an amenable number.

1940401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940401 is an equidigital number, since it uses as much as digits as its factorization.

1940401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1940401 is about 1392.9827708913. The cubic root of 1940401 is about 124.7279630634.

Adding to 1940401 its reverse (1040491), we get a palindrome (2980892).

The spelling of 1940401 in words is "one million, nine hundred forty thousand, four hundred one".