90939389 has 4 divisors (see below), whose sum is σ = 94075260. Its totient is φ = 87803520.

The previous prime is 90939383. The next prime is 90939391. The reversal of 90939389 is 98393909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64673764 + 26265625 = 8042^2 + 5125^2 .

It is a cyclic number.

It is not a de Polignac number, because 90939389 - 2⁸ = 90939133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90939383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567892 + ... + 1567949.

It is an arithmetic number, because the mean of its divisors is an integer number (23518815).

Almost surely, 2^90939389 is an apocalyptic number.

It is an amenable number.

90939389 is a deficient number, since it is larger than the sum of its proper divisors (3135871).

90939389 is a wasteful number, since it uses less digits than its factorization.

90939389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135870.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 90939389 is about 9536.2146053872. The cubic root of 90939389 is about 449.6942598099.

The spelling of 90939389 in words is "ninety million, nine hundred thirty-nine thousand, three hundred eighty-nine".