409442 has 16 divisors (see below), whose sum is σ = 689472. Its totient is φ = 180720.

The previous prime is 409441. The next prime is 409463. The reversal of 409442 is 244904.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (409441) 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 7 ways as a sum of consecutive naturals, for example, 563 + ... + 1065.

It is an arithmetic number, because the mean of its divisors is an integer number (43092).

2⁴⁰⁹⁴⁴² is an apocalyptic number.

409442 is a deficient number, since it is larger than the sum of its proper divisors (280030).

409442 is a wasteful number, since it uses less digits than its factorization.

409442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 409442 is about 639.8765505939. The cubic root of 409442 is about 74.2558710077.

The spelling of 409442 in words is "four hundred nine thousand, four hundred forty-two".