90439187 has 2 divisors, whose sum is σ = 90439188. Its totient is φ = 90439186.

The previous prime is 90439177. The next prime is 90439229. The reversal of 90439187 is 78193409.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90439187 - 2⁴ = 90439171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90439127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219593 + 45219594.

It is an arithmetic number, because the mean of its divisors is an integer number (45219594).

Almost surely, 2^90439187 is an apocalyptic number.

90439187 is a deficient number, since it is larger than the sum of its proper divisors (1).

90439187 is an equidigital number, since it uses as much as digits as its factorization.

90439187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 90439187 is about 9509.9519977758. The cubic root of 90439187 is about 448.8682457254.

The spelling of 90439187 in words is "ninety million, four hundred thirty-nine thousand, one hundred eighty-seven".