423215389 has 2 divisors, whose sum is σ = 423215390. Its totient is φ = 423215388.

The previous prime is 423215371. The next prime is 423215393. The reversal of 423215389 is 983512324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421480900 + 1734489 = 20530^2 + 1317^2 .

It is a cyclic number.

It is not a de Polignac number, because 423215389 - 2¹¹ = 423213341 is a prime.

It is a super-2 number, since 2×423215389² = 358222530972842642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423215369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211607694 + 211607695.

It is an arithmetic number, because the mean of its divisors is an integer number (211607695).

Almost surely, 2^423215389 is an apocalyptic number.

It is an amenable number.

423215389 is a deficient number, since it is larger than the sum of its proper divisors (1).

423215389 is an equidigital number, since it uses as much as digits as its factorization.

423215389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 423215389 is about 20572.1994205773. The cubic root of 423215389 is about 750.7934648479.

The spelling of 423215389 in words is "four hundred twenty-three million, two hundred fifteen thousand, three hundred eighty-nine".