87474389 has 2 divisors, whose sum is σ = 87474390. Its totient is φ = 87474388.

The previous prime is 87474349. The next prime is 87474391. The reversal of 87474389 is 98347478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 22800625 = 8042^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 87474389 - 2²⁴ = 70697173 is a prime.

Together with 87474391, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87474349) 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 as a sum of consecutive naturals, namely, 43737194 + 43737195.

It is an arithmetic number, because the mean of its divisors is an integer number (43737195).

Almost surely, 2^87474389 is an apocalyptic number.

It is an amenable number.

87474389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87474389 is an equidigital number, since it uses as much as digits as its factorization.

87474389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 50.

The square root of 87474389 is about 9352.7744012138. The cubic root of 87474389 is about 443.9086821505.

The spelling of 87474389 in words is "eighty-seven million, four hundred seventy-four thousand, three hundred eighty-nine".