423129397 has 2 divisors, whose sum is σ = 423129398. Its totient is φ = 423129396.

The previous prime is 423129383. The next prime is 423129409. The reversal of 423129397 is 793921324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321341476 + 101787921 = 17926^2 + 10089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423129397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424129397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211564698 + 211564699.

It is an arithmetic number, because the mean of its divisors is an integer number (211564699).

Almost surely, 2^423129397 is an apocalyptic number.

It is an amenable number.

423129397 is a deficient number, since it is larger than the sum of its proper divisors (1).

423129397 is an equidigital number, since it uses as much as digits as its factorization.

423129397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 423129397 is about 20570.1093093838. The cubic root of 423129397 is about 750.7426108332.

The spelling of 423129397 in words is "four hundred twenty-three million, one hundred twenty-nine thousand, three hundred ninety-seven".