87894421 has 2 divisors, whose sum is σ = 87894422. Its totient is φ = 87894420.

The previous prime is 87894413. The next prime is 87894449. The reversal of 87894421 is 12449878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83010321 + 4884100 = 9111^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 87894421 - 2³ = 87894413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87894491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43947210 + 43947211.

It is an arithmetic number, because the mean of its divisors is an integer number (43947211).

Almost surely, 2^87894421 is an apocalyptic number.

It is an amenable number.

87894421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87894421 is an equidigital number, since it uses as much as digits as its factorization.

87894421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 87894421 is about 9375.2024511474. The cubic root of 87894421 is about 444.6180639016.

The spelling of 87894421 in words is "eighty-seven million, eight hundred ninety-four thousand, four hundred twenty-one".