90438393 has 4 divisors (see below), whose sum is σ = 120584528. Its totient is φ = 60292260.

The previous prime is 90438379. The next prime is 90438401. The reversal of 90438393 is 39383409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90438393 - 2¹⁶ = 90372857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90438343) 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, 15073063 + ... + 15073068.

It is an arithmetic number, because the mean of its divisors is an integer number (30146132).

Almost surely, 2^90438393 is an apocalyptic number.

It is an amenable number.

90438393 is a deficient number, since it is larger than the sum of its proper divisors (30146135).

90438393 is a wasteful number, since it uses less digits than its factorization.

90438393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30146134.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 90438393 is about 9509.9102519424. The cubic root of 90438393 is about 448.8669321266.

The spelling of 90438393 in words is "ninety million, four hundred thirty-eight thousand, three hundred ninety-three".