405017923 has 2 divisors, whose sum is σ = 405017924. Its totient is φ = 405017922.

The previous prime is 405017887. The next prime is 405017929. The reversal of 405017923 is 329710504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405017923 is a prime.

It is not a weakly prime, because it can be changed into another prime (405017929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202508961 + 202508962.

It is an arithmetic number, because the mean of its divisors is an integer number (202508962).

Almost surely, 2^405017923 is an apocalyptic number.

405017923 is a deficient number, since it is larger than the sum of its proper divisors (1).

405017923 is an equidigital number, since it uses as much as digits as its factorization.

405017923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 405017923 is about 20125.0570930867. The cubic root of 405017923 is about 739.8745361922.

The spelling of 405017923 in words is "four hundred five million, seventeen thousand, nine hundred twenty-three".