405230257 has 2 divisors, whose sum is σ = 405230258. Its totient is φ = 405230256.

The previous prime is 405230249. The next prime is 405230279. The reversal of 405230257 is 752032504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388247616 + 16982641 = 19704^2 + 4121^2 .

It is a cyclic number.

It is not a de Polignac number, because 405230257 - 2³ = 405230249 is a prime.

It is a super-2 number, since 2×405230257² = 328423122376572098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405230297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202615128 + 202615129.

It is an arithmetic number, because the mean of its divisors is an integer number (202615129).

Almost surely, 2^405230257 is an apocalyptic number.

It is an amenable number.

405230257 is a deficient number, since it is larger than the sum of its proper divisors (1).

405230257 is an equidigital number, since it uses as much as digits as its factorization.

405230257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 405230257 is about 20130.3317657708. The cubic root of 405230257 is about 740.0038087216.

The spelling of 405230257 in words is "four hundred five million, two hundred thirty thousand, two hundred fifty-seven".