405227689 has 2 divisors, whose sum is σ = 405227690. Its totient is φ = 405227688.

The previous prime is 405227653. The next prime is 405227699. The reversal of 405227689 is 986722504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317018025 + 88209664 = 17805^2 + 9392^2 .

It is a cyclic number.

It is not a de Polignac number, because 405227689 - 2²⁵ = 371673257 is a prime.

It is not a weakly prime, because it can be changed into another prime (405227609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202613844 + 202613845.

It is an arithmetic number, because the mean of its divisors is an integer number (202613845).

Almost surely, 2^405227689 is an apocalyptic number.

It is an amenable number.

405227689 is a deficient number, since it is larger than the sum of its proper divisors (1).

405227689 is an equidigital number, since it uses as much as digits as its factorization.

405227689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 405227689 is about 20130.2679813260. The cubic root of 405227689 is about 740.0022455496.

The spelling of 405227689 in words is "four hundred five million, two hundred twenty-seven thousand, six hundred eighty-nine".