405252889 has 2 divisors, whose sum is σ = 405252890. Its totient is φ = 405252888.

The previous prime is 405252853. The next prime is 405252901. The reversal of 405252889 is 988252504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344288025 + 60964864 = 18555^2 + 7808^2 .

It is a cyclic number.

It is not a de Polignac number, because 405252889 - 2¹⁹ = 404728601 is a prime.

It is not a weakly prime, because it can be changed into another prime (405252389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202626444 + 202626445.

It is an arithmetic number, because the mean of its divisors is an integer number (202626445).

Almost surely, 2^405252889 is an apocalyptic number.

It is an amenable number.

405252889 is a deficient number, since it is larger than the sum of its proper divisors (1).

405252889 is an equidigital number, since it uses as much as digits as its factorization.

405252889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 405252889 is about 20130.8938947082. The cubic root of 405252889 is about 740.0175848025.

The spelling of 405252889 in words is "four hundred five million, two hundred fifty-two thousand, eight hundred eighty-nine".