405155123 has 2 divisors, whose sum is σ = 405155124. Its totient is φ = 405155122.

The previous prime is 405155117. The next prime is 405155131. The reversal of 405155123 is 321551504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405155123 - 2¹⁴ = 405138739 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 405155092 and 405155101.

It is not a weakly prime, because it can be changed into another prime (405155173) 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, 202577561 + 202577562.

It is an arithmetic number, because the mean of its divisors is an integer number (202577562).

Almost surely, 2^405155123 is an apocalyptic number.

405155123 is a deficient number, since it is larger than the sum of its proper divisors (1).

405155123 is an equidigital number, since it uses as much as digits as its factorization.

405155123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 405155123 is about 20128.4654904441. The cubic root of 405155123 is about 739.9580710356.

The spelling of 405155123 in words is "four hundred five million, one hundred fifty-five thousand, one hundred twenty-three".