405489091 has 4 divisors (see below), whose sum is σ = 463416112. Its totient is φ = 347562072.

The previous prime is 405489059. The next prime is 405489101. The reversal of 405489091 is 190984504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405489091 - 2⁵ = 405489059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405489001) 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 in 3 ways as a sum of consecutive naturals, for example, 28963500 + ... + 28963513.

It is an arithmetic number, because the mean of its divisors is an integer number (115854028).

Almost surely, 2^405489091 is an apocalyptic number.

405489091 is a deficient number, since it is larger than the sum of its proper divisors (57927021).

405489091 is an equidigital number, since it uses as much as digits as its factorization.

405489091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57927020.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 405489091 is about 20136.7596946480. The cubic root of 405489091 is about 740.1613301771.

The spelling of 405489091 in words is "four hundred five million, four hundred eighty-nine thousand, ninety-one".