605990405 has 18 divisors (see below), whose sum is σ = 741259638. Its totient is φ = 475588800.

The previous prime is 605990383. The next prime is 605990423. The reversal of 605990405 is 504099506.

It can be written as a sum of positive squares in 9 ways, for example, as 61748164 + 544242241 = 7858^2 + 23329^2 .

It is not a de Polignac number, because 605990405 - 2¹² = 605986309 is a prime.

It is a super-3 number, since 3×605990405³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 5559491 + ... + 5559599.

It is an arithmetic number, because the mean of its divisors is an integer number (41181091).

Almost surely, 2^605990405 is an apocalyptic number.

It is an amenable number.

605990405 is a deficient number, since it is larger than the sum of its proper divisors (135269233).

605990405 is an equidigital number, since it uses as much as digits as its factorization.

605990405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 605990405 is about 24616.8723642952. The cubic root of 605990405 is about 846.2303215018.

The spelling of 605990405 in words is "six hundred five million, nine hundred ninety thousand, four hundred five".