420023893 has 2 divisors, whose sum is σ = 420023894. Its totient is φ = 420023892.

The previous prime is 420023881. The next prime is 420023909. The reversal of 420023893 is 398320024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235254244 + 184769649 = 15338^2 + 13593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420023893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420023833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210011946 + 210011947.

It is an arithmetic number, because the mean of its divisors is an integer number (210011947).

Almost surely, 2^420023893 is an apocalyptic number.

It is an amenable number.

420023893 is a deficient number, since it is larger than the sum of its proper divisors (1).

420023893 is an equidigital number, since it uses as much as digits as its factorization.

420023893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 420023893 is about 20494.4844531401. The cubic root of 420023893 is about 748.9014393754.

The spelling of 420023893 in words is "four hundred twenty million, twenty-three thousand, eight hundred ninety-three".