409642 has 4 divisors (see below), whose sum is σ = 614466. Its totient is φ = 204820.

The previous prime is 409639. The next prime is 409657. The reversal of 409642 is 246904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 301401 + 108241 = 549^2 + 329^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102409 + ... + 102412.

2⁴⁰⁹⁶⁴² is an apocalyptic number.

409642 is a deficient number, since it is larger than the sum of its proper divisors (204824).

409642 is a wasteful number, since it uses less digits than its factorization.

409642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204823.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 409642 is about 640.0328116589. The cubic root of 409642 is about 74.2679596199.

The spelling of 409642 in words is "four hundred nine thousand, six hundred forty-two".