405148969 has 2 divisors, whose sum is σ = 405148970. Its totient is φ = 405148968.

The previous prime is 405148901. The next prime is 405148987. The reversal of 405148969 is 969841504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361760400 + 43388569 = 19020^2 + 6587^2 .

It is a cyclic number.

It is not a de Polignac number, because 405148969 - 2¹⁹ = 404624681 is a prime.

It is a super-2 number, since 2×405148969² = 328291374163525922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405148169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202574484 + 202574485.

It is an arithmetic number, because the mean of its divisors is an integer number (202574485).

Almost surely, 2^405148969 is an apocalyptic number.

It is an amenable number.

405148969 is a deficient number, since it is larger than the sum of its proper divisors (1).

405148969 is an equidigital number, since it uses as much as digits as its factorization.

405148969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 405148969 is about 20128.3126217773. The cubic root of 405148969 is about 739.9543245487.

The spelling of 405148969 in words is "four hundred five million, one hundred forty-eight thousand, nine hundred sixty-nine".