7874221 has 2 divisors, whose sum is σ = 7874222. Its totient is φ = 7874220.

The previous prime is 7874219. The next prime is 7874233. The reversal of 7874221 is 1224787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7502121 + 372100 = 2739^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 7874221 - 2¹ = 7874219 is a prime.

Together with 7874219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7874201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3937110 + 3937111.

It is an arithmetic number, because the mean of its divisors is an integer number (3937111).

Almost surely, 2^7874221 is an apocalyptic number.

It is an amenable number.

7874221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7874221 is an equidigital number, since it uses as much as digits as its factorization.

7874221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 31.

The square root of 7874221 is about 2806.1042389762. The cubic root of 7874221 is about 198.9462999974.

The spelling of 7874221 in words is "seven million, eight hundred seventy-four thousand, two hundred twenty-one".