1642421 has 8 divisors (see below), whose sum is σ = 1897344. Its totient is φ = 1405120.

The previous prime is 1642397. The next prime is 1642423. The reversal of 1642421 is 1242461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1642421 - 2¹⁸ = 1380277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1642393 and 1642402.

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 7 ways as a sum of consecutive naturals, for example, 4205 + ... + 4578.

It is an arithmetic number, because the mean of its divisors is an integer number (237168).

2^1642421 is an apocalyptic number.

1642421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1642421 is a deficient number, since it is larger than the sum of its proper divisors (254923).

1642421 is a wasteful number, since it uses less digits than its factorization.

1642421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8811.

The product of its digits is 384, while the sum is 20.

The square root of 1642421 is about 1281.5697405916. The cubic root of 1642421 is about 117.9853711636.

Adding to 1642421 its reverse (1242461), we get a palindrome (2884882).

The spelling of 1642421 in words is "one million, six hundred forty-two thousand, four hundred twenty-one".