90387893 has 2 divisors, whose sum is σ = 90387894. Its totient is φ = 90387892.

The previous prime is 90387889. The next prime is 90387911. The reversal of 90387893 is 39878309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68923204 + 21464689 = 8302^2 + 4633^2 .

It is an emirp because it is prime and its reverse (39878309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90387893 - 2² = 90387889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90387853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45193946 + 45193947.

It is an arithmetic number, because the mean of its divisors is an integer number (45193947).

Almost surely, 2^90387893 is an apocalyptic number.

It is an amenable number.

90387893 is a deficient number, since it is larger than the sum of its proper divisors (1).

90387893 is an equidigital number, since it uses as much as digits as its factorization.

90387893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 90387893 is about 9507.2547562375. The cubic root of 90387893 is about 448.7833687940.

The spelling of 90387893 in words is "ninety million, three hundred eighty-seven thousand, eight hundred ninety-three".