420939637 has 2 divisors, whose sum is σ = 420939638. Its totient is φ = 420939636.

The previous prime is 420939581. The next prime is 420939641. The reversal of 420939637 is 736939024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240064036 + 180875601 = 15494^2 + 13449^2 .

It is a cyclic number.

It is not a de Polignac number, because 420939637 - 2²⁷ = 286721909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420939593 and 420939602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420939667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210469818 + 210469819.

It is an arithmetic number, because the mean of its divisors is an integer number (210469819).

Almost surely, 2^420939637 is an apocalyptic number.

It is an amenable number.

420939637 is a deficient number, since it is larger than the sum of its proper divisors (1).

420939637 is an equidigital number, since it uses as much as digits as its factorization.

420939637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 420939637 is about 20516.8135196477. The cubic root of 420939637 is about 749.4453006608.

The spelling of 420939637 in words is "four hundred twenty million, nine hundred thirty-nine thousand, six hundred thirty-seven".