90423434 has 4 divisors (see below), whose sum is σ = 135635154. Its totient is φ = 45211716.

The previous prime is 90423433. The next prime is 90423469. The reversal of 90423434 is 43432409.

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

It can be written as a sum of positive squares in only one way, i.e., 56957209 + 33466225 = 7547^2 + 5785^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90423397 and 90423406.

It is not an unprimeable number, because it can be changed into a prime (90423433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22605857 + ... + 22605860.

Almost surely, 2^90423434 is an apocalyptic number.

90423434 is a deficient number, since it is larger than the sum of its proper divisors (45211720).

90423434 is a wasteful number, since it uses less digits than its factorization.

90423434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45211719.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 90423434 is about 9509.1237240873. The cubic root of 90423434 is about 448.8421824214.

Subtracting from 90423434 its reverse (43432409), we obtain a square (46991025 = 6855²).

The spelling of 90423434 in words is "ninety million, four hundred twenty-three thousand, four hundred thirty-four".