1642404 has 48 divisors (see below), whose sum is σ = 4148928. Its totient is φ = 503808.

The previous prime is 1642397. The next prime is 1642423. The reversal of 1642404 is 4042461.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16884 + ... + 16980.

It is an arithmetic number, because the mean of its divisors is an integer number (86436).

2^1642404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2074464).

1642404 is an abundant number, since it is smaller than the sum of its proper divisors (2506524).

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

1642404 is a wasteful number, since it uses less digits than its factorization.

1642404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1642404 is about 1281.5631080833. The cubic root of 1642404 is about 117.9849640901.

Adding to 1642404 its reverse (4042461), we get a palindrome (5684865).

The spelling of 1642404 in words is "one million, six hundred forty-two thousand, four hundred four".