1920001 has 2 divisors, whose sum is σ = 1920002. Its totient is φ = 1920000.

The previous prime is 1919987. The next prime is 1920011. The reversal of 1920001 is 1000291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1560001 + 360000 = 1249^2 + 600^2 .

It is an emirp because it is prime and its reverse (1000291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960000 + 960001.

It is an arithmetic number, because the mean of its divisors is an integer number (960001).

2^1920001 is an apocalyptic number.

It is an amenable number.

1920001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920001 is an equidigital number, since it uses as much as digits as its factorization.

1920001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1920001 is about 1385.6410068990. The cubic root of 1920001 is about 124.2893218162.

Adding to 1920001 its reverse (1000291), we get a palindrome (2920292).

The spelling of 1920001 in words is "one million, nine hundred twenty thousand, one".