7642021 has 4 divisors (see below), whose sum is σ = 7670700. Its totient is φ = 7613344.

The previous prime is 7642013. The next prime is 7642039. The reversal of 7642021 is 1202467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2402500 + 5239521 = 1550^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 7642021 - 2³ = 7642013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7641983 and 7642001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7642121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13936 + ... + 14473.

It is an arithmetic number, because the mean of its divisors is an integer number (1917675).

Almost surely, 2^7642021 is an apocalyptic number.

It is an amenable number.

7642021 is a deficient number, since it is larger than the sum of its proper divisors (28679).

7642021 is a wasteful number, since it uses less digits than its factorization.

7642021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28678.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 7642021 is about 2764.4205541126. The cubic root of 7642021 is about 196.9712052187.

Adding to 7642021 its reverse (1202467), we get a palindrome (8844488).

The spelling of 7642021 in words is "seven million, six hundred forty-two thousand, twenty-one".