2005386990 has 32 divisors (see below), whose sum is σ = 4894508160. Its totient is φ = 525705504.

The previous prime is 2005386989. The next prime is 2005386991. The reversal of 2005386990 is 996835002.

It is an interprime number because it is at equal distance from previous prime (2005386989) and next prime (2005386991).

It is a super-2 number, since 2×2005386990² = 8043153959322520200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005386991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564724 + ... + 568263.

It is an arithmetic number, because the mean of its divisors is an integer number (152953380).

Almost surely, 2^2005386990 is an apocalyptic number.

2005386990 is an abundant number, since it is smaller than the sum of its proper divisors (2889121170).

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

2005386990 is a wasteful number, since it uses less digits than its factorization.

2005386990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133056.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 2005386990 is about 44781.5474274840. The cubic root of 2005386990 is about 1261.0512328035.

The spelling of 2005386990 in words is "two billion, five million, three hundred eighty-six thousand, nine hundred ninety".