1642428 has 36 divisors (see below), whose sum is σ = 4252248. Its totient is φ = 534240.

The previous prime is 1642423. The next prime is 1642441. The reversal of 1642428 is 8242461.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1018 + ... + 2078.

It is an arithmetic number, because the mean of its divisors is an integer number (118118).

2^1642428 is an apocalyptic number.

1642428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2126124).

1642428 is an abundant number, since it is smaller than the sum of its proper divisors (2609820).

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

1642428 is a wasteful number, since it uses less digits than its factorization.

1642428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1109 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 1642428 is about 1281.5724716145. The cubic root of 1642428 is about 117.9855387813.

Adding to 1642428 its reverse (8242461), we get a palindrome (9884889).

The spelling of 1642428 in words is "one million, six hundred forty-two thousand, four hundred twenty-eight".