405491089 has 8 divisors (see below), whose sum is σ = 429572808. Its totient is φ = 381434880.

The previous prime is 405491071. The next prime is 405491101. The reversal of 405491089 is 980194504.

It can be written as a sum of positive squares in 4 ways, for example, as 219632400 + 185858689 = 14820^2 + 13633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405491089 - 2⁷ = 405490961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405491069) 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 7 ways as a sum of consecutive naturals, for example, 33549 + ... + 44005.

It is an arithmetic number, because the mean of its divisors is an integer number (53696601).

Almost surely, 2^405491089 is an apocalyptic number.

It is an amenable number.

405491089 is a deficient number, since it is larger than the sum of its proper divisors (24081719).

405491089 is a wasteful number, since it uses less digits than its factorization.

405491089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12755.

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

The square root of 405491089 is about 20136.8093053492. The cubic root of 405491089 is about 740.1625458612.

The spelling of 405491089 in words is "four hundred five million, four hundred ninety-one thousand, eighty-nine".