90408847 has 2 divisors, whose sum is σ = 90408848. Its totient is φ = 90408846.

The previous prime is 90408809. The next prime is 90408881. The reversal of 90408847 is 74880409.

It is a strong prime.

It is an emirp because it is prime and its reverse (74880409) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90408847 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 (90408547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45204423 + 45204424.

It is an arithmetic number, because the mean of its divisors is an integer number (45204424).

Almost surely, 2^90408847 is an apocalyptic number.

90408847 is a deficient number, since it is larger than the sum of its proper divisors (1).

90408847 is an equidigital number, since it uses as much as digits as its factorization.

90408847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 90408847 is about 9508.3566929307. The cubic root of 90408847 is about 448.8180455625.

The spelling of 90408847 in words is "ninety million, four hundred eight thousand, eight hundred forty-seven".