84394621 has 2 divisors, whose sum is σ = 84394622. Its totient is φ = 84394620.

The previous prime is 84394591. The next prime is 84394631. The reversal of 84394621 is 12649348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59892121 + 24502500 = 7739^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 84394621 - 2⁵ = 84394589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84394631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42197310 + 42197311.

It is an arithmetic number, because the mean of its divisors is an integer number (42197311).

Almost surely, 2^84394621 is an apocalyptic number.

It is an amenable number.

84394621 is a deficient number, since it is larger than the sum of its proper divisors (1).

84394621 is an equidigital number, since it uses as much as digits as its factorization.

84394621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 84394621 is about 9186.6545053137. The cubic root of 84394621 is about 438.6366564092.

The spelling of 84394621 in words is "eighty-four million, three hundred ninety-four thousand, six hundred twenty-one".