420789137 has 2 divisors, whose sum is σ = 420789138. Its totient is φ = 420789136.

The previous prime is 420789091. The next prime is 420789139. The reversal of 420789137 is 731987024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216413521 + 204375616 = 14711^2 + 14296^2 .

It is a cyclic number.

It is not a de Polignac number, because 420789137 - 2¹⁸ = 420526993 is a prime.

Together with 420789139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 420789094 and 420789103.

It is not a weakly prime, because it can be changed into another prime (420789139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210394568 + 210394569.

It is an arithmetic number, because the mean of its divisors is an integer number (210394569).

Almost surely, 2^420789137 is an apocalyptic number.

It is an amenable number.

420789137 is a deficient number, since it is larger than the sum of its proper divisors (1).

420789137 is an equidigital number, since it uses as much as digits as its factorization.

420789137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 420789137 is about 20513.1454682114. The cubic root of 420789137 is about 749.3559727598.

It can be divided in two parts, 42078 and 9137, that added together give a palindrome (51215).

The spelling of 420789137 in words is "four hundred twenty million, seven hundred eighty-nine thousand, one hundred thirty-seven".