90439087 has 2 divisors, whose sum is σ = 90439088. Its totient is φ = 90439086.

The previous prime is 90439067. The next prime is 90439093. The reversal of 90439087 is 78093409.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90439087 - 2¹⁵ = 90406319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90439057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219543 + 45219544.

It is an arithmetic number, because the mean of its divisors is an integer number (45219544).

Almost surely, 2^90439087 is an apocalyptic number.

90439087 is a deficient number, since it is larger than the sum of its proper divisors (1).

90439087 is an equidigital number, since it uses as much as digits as its factorization.

90439087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90439087 is about 9509.9467401243. The cubic root of 90439087 is about 448.8680802852.

The spelling of 90439087 in words is "ninety million, four hundred thirty-nine thousand, eighty-seven".