409090 has 16 divisors (see below), whose sum is σ = 803520. Its totient is φ = 148720.

The previous prime is 409081. The next prime is 409099. The reversal of 409090 is 90904.

It is an interprime number because it is at equal distance from previous prime (409081) and next prime (409099).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

409090 is a modest number, since divided by 9090 gives 40 as remainder.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 409090.

It is not an unprimeable number, because it can be changed into a prime (409099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1750 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (50220).

2⁴⁰⁹⁰⁹⁰ is an apocalyptic number.

409090 is a deficient number, since it is larger than the sum of its proper divisors (394430).

409090 is a wasteful number, since it uses less digits than its factorization.

409090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 409090 is about 639.6014383974. The cubic root of 409090 is about 74.2345854853.

Adding to 409090 its reverse (90904), we get a palindrome (499994).

The spelling of 409090 in words is "four hundred nine thousand, ninety".