83887409 has 2 divisors, whose sum is σ = 83887410. Its totient is φ = 83887408.

The previous prime is 83887387. The next prime is 83887421. The reversal of 83887409 is 90478838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47224384 + 36663025 = 6872^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 83887409 - 2¹² = 83883313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83880409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41943704 + 41943705.

It is an arithmetic number, because the mean of its divisors is an integer number (41943705).

Almost surely, 2^83887409 is an apocalyptic number.

It is an amenable number.

83887409 is a deficient number, since it is larger than the sum of its proper divisors (1).

83887409 is an equidigital number, since it uses as much as digits as its factorization.

83887409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 83887409 is about 9159.0069876597. The cubic root of 83887409 is about 437.7561541026.

The spelling of 83887409 in words is "eighty-three million, eight hundred eighty-seven thousand, four hundred nine".