420409973 has 2 divisors, whose sum is σ = 420409974. Its totient is φ = 420409972.

The previous prime is 420409963. The next prime is 420409991. The reversal of 420409973 is 379904024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409374289 + 11035684 = 20233^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 420409973 - 2¹⁶ = 420344437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420409943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210204986 + 210204987.

It is an arithmetic number, because the mean of its divisors is an integer number (210204987).

Almost surely, 2^420409973 is an apocalyptic number.

It is an amenable number.

420409973 is a deficient number, since it is larger than the sum of its proper divisors (1).

420409973 is an equidigital number, since it uses as much as digits as its factorization.

420409973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 420409973 is about 20503.9014092440. The cubic root of 420409973 is about 749.1308289632.

The spelling of 420409973 in words is "four hundred twenty million, four hundred nine thousand, nine hundred seventy-three".