605990 has 32 divisors (see below), whose sum is σ = 1361664. Its totient is φ = 188640.

The previous prime is 605987. The next prime is 605993. The reversal of 605990 is 99506.

It is an interprime number because it is at equal distance from previous prime (605987) and next prime (605993).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (42552).

2⁶⁰⁵⁹⁹⁰ is an apocalyptic number.

605990 is an abundant number, since it is smaller than the sum of its proper divisors (755674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

605990 is a wasteful number, since it uses less digits than its factorization.

605990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 605990 is about 778.4535952772. The cubic root of 605990 is about 84.6230132982.

The spelling of 605990 in words is "six hundred five thousand, nine hundred ninety".