7838421 has 8 divisors (see below), whose sum is σ = 10706304. Its totient is φ = 5098080.

The previous prime is 7838407. The next prime is 7838429. The reversal of 7838421 is 1248387.

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

It is not a de Polignac number, because 7838421 - 2⁷ = 7838293 is a prime.

It is a super-2 number, since 2×7838421² = 122881687546482, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7838429) 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, 31741 + ... + 31986.

It is an arithmetic number, because the mean of its divisors is an integer number (1338288).

Almost surely, 2^7838421 is an apocalyptic number.

It is an amenable number.

7838421 is a deficient number, since it is larger than the sum of its proper divisors (2867883).

7838421 is a wasteful number, since it uses less digits than its factorization.

7838421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63771.

The product of its digits is 10752, while the sum is 33.

The square root of 7838421 is about 2799.7180215157. The cubic root of 7838421 is about 198.6443400256.

The spelling of 7838421 in words is "seven million, eight hundred thirty-eight thousand, four hundred twenty-one".