87404309 has 2 divisors, whose sum is σ = 87404310. Its totient is φ = 87404308.

The previous prime is 87404281. The next prime is 87404329. The reversal of 87404309 is 90340478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68525284 + 18879025 = 8278^2 + 4345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87404309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87404329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43702154 + 43702155.

It is an arithmetic number, because the mean of its divisors is an integer number (43702155).

Almost surely, 2^87404309 is an apocalyptic number.

It is an amenable number.

87404309 is a deficient number, since it is larger than the sum of its proper divisors (1).

87404309 is an equidigital number, since it uses as much as digits as its factorization.

87404309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 87404309 is about 9349.0271686417. The cubic root of 87404309 is about 443.7901048459.

The spelling of 87404309 in words is "eighty-seven million, four hundred four thousand, three hundred nine".