422878237 has 2 divisors, whose sum is σ = 422878238. Its totient is φ = 422878236.

The previous prime is 422878219. The next prime is 422878243. The reversal of 422878237 is 732878224.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368870436 + 54007801 = 19206^2 + 7349^2 .

It is a cyclic number.

It is not a de Polignac number, because 422878237 - 2⁷ = 422878109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 422878193 and 422878202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422878637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211439118 + 211439119.

It is an arithmetic number, because the mean of its divisors is an integer number (211439119).

Almost surely, 2^422878237 is an apocalyptic number.

It is an amenable number.

422878237 is a deficient number, since it is larger than the sum of its proper divisors (1).

422878237 is an equidigital number, since it uses as much as digits as its factorization.

422878237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301056, while the sum is 43.

The square root of 422878237 is about 20564.0034283211. The cubic root of 422878237 is about 750.5940401789.

The spelling of 422878237 in words is "four hundred twenty-two million, eight hundred seventy-eight thousand, two hundred thirty-seven".