420690233 has 2 divisors, whose sum is σ = 420690234. Its totient is φ = 420690232.

The previous prime is 420690227. The next prime is 420690241. The reversal of 420690233 is 332096024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366990649 + 53699584 = 19157^2 + 7328^2 .

It is a cyclic number.

It is not a de Polignac number, because 420690233 - 2¹² = 420686137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420690196 and 420690205.

It is not a weakly prime, because it can be changed into another prime (420690293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210345116 + 210345117.

It is an arithmetic number, because the mean of its divisors is an integer number (210345117).

Almost surely, 2^420690233 is an apocalyptic number.

It is an amenable number.

420690233 is a deficient number, since it is larger than the sum of its proper divisors (1).

420690233 is an equidigital number, since it uses as much as digits as its factorization.

420690233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 420690233 is about 20510.7345797268. The cubic root of 420690233 is about 749.2972575950.

The spelling of 420690233 in words is "four hundred twenty million, six hundred ninety thousand, two hundred thirty-three".