423700421 has 2 divisors, whose sum is σ = 423700422. Its totient is φ = 423700420.

The previous prime is 423700379. The next prime is 423700439. The reversal of 423700421 is 124007324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391050625 + 32649796 = 19775^2 + 5714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423700421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423700471) 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, 211850210 + 211850211.

It is an arithmetic number, because the mean of its divisors is an integer number (211850211).

Almost surely, 2^423700421 is an apocalyptic number.

It is an amenable number.

423700421 is a deficient number, since it is larger than the sum of its proper divisors (1).

423700421 is an equidigital number, since it uses as much as digits as its factorization.

423700421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 423700421 is about 20583.9845753926. The cubic root of 423700421 is about 751.0801745135.

Adding to 423700421 its reverse (124007324), we get a palindrome (547707745).

The spelling of 423700421 in words is "four hundred twenty-three million, seven hundred thousand, four hundred twenty-one".