1963921 has 2 divisors, whose sum is σ = 1963922. Its totient is φ = 1963920.

The previous prime is 1963889. The next prime is 1963981. The reversal of 1963921 is 1293691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 923521 = 1020^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963921 - 2⁵ = 1963889 is a prime.

1963921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1963981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981960 + 981961.

It is an arithmetic number, because the mean of its divisors is an integer number (981961).

2^1963921 is an apocalyptic number.

It is an amenable number.

1963921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963921 is an equidigital number, since it uses as much as digits as its factorization.

1963921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 1963921 is about 1401.3996574853. The cubic root of 1963921 is about 125.2298916063.

The spelling of 1963921 in words is "one million, nine hundred sixty-three thousand, nine hundred twenty-one".