90435909 has 4 divisors (see below), whose sum is σ = 120581216. Its totient is φ = 60290604.

The previous prime is 90435901. The next prime is 90435911. The reversal of 90435909 is 90953409.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90953409 = 3 ⋅30317803.

It is not a de Polignac number, because 90435909 - 2³ = 90435901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90435901) 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, 15072649 + ... + 15072654.

It is an arithmetic number, because the mean of its divisors is an integer number (30145304).

Almost surely, 2^90435909 is an apocalyptic number.

It is an amenable number.

90435909 is a deficient number, since it is larger than the sum of its proper divisors (30145307).

90435909 is a wasteful number, since it uses less digits than its factorization.

90435909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30145306.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 90435909 is about 9509.7796504441. The cubic root of 90435909 is about 448.8628225310.

The spelling of 90435909 in words is "ninety million, four hundred thirty-five thousand, nine hundred nine".