8991434 has 4 divisors (see below), whose sum is σ = 13487154. Its totient is φ = 4495716.

The previous prime is 8991431. The next prime is 8991439. The reversal of 8991434 is 4341998.

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., 8497225 + 494209 = 2915^2 + 703^2 .

It is not an unprimeable number, because it can be changed into a prime (8991431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2247857 + ... + 2247860.

Almost surely, 2^8991434 is an apocalyptic number.

8991434 is a deficient number, since it is larger than the sum of its proper divisors (4495720).

8991434 is a wasteful number, since it uses less digits than its factorization.

8991434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495719.

The product of its digits is 31104, while the sum is 38.

The square root of 8991434 is about 2998.5719934662. The cubic root of 8991434 is about 207.9423687721.

The spelling of 8991434 in words is "eight million, nine hundred ninety-one thousand, four hundred thirty-four".