1423921 has 2 divisors, whose sum is σ = 1423922. Its totient is φ = 1423920.

The previous prime is 1423909. The next prime is 1423931. The reversal of 1423921 is 1293241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 112896 = 1145^2 + 336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1423892 and 1423901.

It is not a weakly prime, because it can be changed into another prime (1423901) 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, 711960 + 711961.

It is an arithmetic number, because the mean of its divisors is an integer number (711961).

2^1423921 is an apocalyptic number.

It is an amenable number.

1423921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423921 is an equidigital number, since it uses as much as digits as its factorization.

1423921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 1423921 is about 1193.2816096798. The cubic root of 1423921 is about 112.5024460374.

The spelling of 1423921 in words is "one million, four hundred twenty-three thousand, nine hundred twenty-one".