409990 has 16 divisors (see below), whose sum is σ = 843552. Its totient is φ = 140544.

The previous prime is 409987. The next prime is 409993. The reversal of 409990 is 99904.

It is an interprime number because it is at equal distance from previous prime (409987) and next prime (409993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2859 + ... + 2998.

It is an arithmetic number, because the mean of its divisors is an integer number (52722).

2⁴⁰⁹⁹⁹⁰ is an apocalyptic number.

409990 is an abundant number, since it is smaller than the sum of its proper divisors (433562).

It is a weird number, because it is abundant, but not a pseudoperfect number.

409990 is a wasteful number, since it uses less digits than its factorization.

409990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 409990 is about 640.3046150076. The cubic root of 409990 is about 74.2889844292.

The spelling of 409990 in words is "four hundred nine thousand, nine hundred ninety".