7182421 has 8 divisors (see below), whose sum is σ = 7596288. Its totient is φ = 6780000.

The previous prime is 7182377. The next prime is 7182433. The reversal of 7182421 is 1242817.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7182421 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7182451) 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, 1555 + ... + 4096.

It is an arithmetic number, because the mean of its divisors is an integer number (949536).

Almost surely, 2^7182421 is an apocalyptic number.

It is an amenable number.

7182421 is a deficient number, since it is larger than the sum of its proper divisors (413867).

7182421 is a wasteful number, since it uses less digits than its factorization.

7182421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723.

The product of its digits is 896, while the sum is 25.

The square root of 7182421 is about 2680.0039179076. The cubic root of 7182421 is about 192.9405975742.

The spelling of 7182421 in words is "seven million, one hundred eighty-two thousand, four hundred twenty-one".