1936721 has 2 divisors, whose sum is σ = 1936722. Its totient is φ = 1936720.

The previous prime is 1936679. The next prime is 1936723. The reversal of 1936721 is 1276391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 18496 = 1385^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1936721 - 2¹⁸ = 1674577 is a prime.

Together with 1936723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1936723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 968360 + 968361.

It is an arithmetic number, because the mean of its divisors is an integer number (968361).

2^1936721 is an apocalyptic number.

It is an amenable number.

1936721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1936721 is an equidigital number, since it uses as much as digits as its factorization.

1936721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 1936721 is about 1391.6612375144. The cubic root of 1936721 is about 124.6490636716.

The spelling of 1936721 in words is "one million, nine hundred thirty-six thousand, seven hundred twenty-one".