7980021 has 24 divisors (see below), whose sum is σ = 13950144. Its totient is φ = 4291200.

The previous prime is 7980013. The next prime is 7980029. The reversal of 7980021 is 1200897.

It is an interprime number because it is at equal distance from previous prime (7980013) and next prime (7980029).

It is not a de Polignac number, because 7980021 - 2³ = 7980013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7980029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2655 + ... + 4796.

It is an arithmetic number, because the mean of its divisors is an integer number (581256).

Almost surely, 2^7980021 is an apocalyptic number.

It is an amenable number.

7980021 is a deficient number, since it is larger than the sum of its proper divisors (5970123).

7980021 is a wasteful number, since it uses less digits than its factorization.

7980021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7481 (or 7478 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 7980021 is about 2824.8930953224. The cubic root of 7980021 is about 199.8333695433.

The spelling of 7980021 in words is "seven million, nine hundred eighty thousand, twenty-one".