8990023639 has 4 divisors (see below), whose sum is σ = 9380894256. Its totient is φ = 8599153024.

The previous prime is 8990023531. The next prime is 8990023663. The reversal of 8990023639 is 9363200998.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8990023639 - 2¹¹ = 8990021591 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8990023592 and 8990023601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8990023039) 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, 195435274 + ... + 195435319.

It is an arithmetic number, because the mean of its divisors is an integer number (2345223564).

Almost surely, 2^8990023639 is an apocalyptic number.

8990023639 is a deficient number, since it is larger than the sum of its proper divisors (390870617).

8990023639 is a wasteful number, since it uses less digits than its factorization.

8990023639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390870616.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 8990023639 is about 94815.7351867294. The cubic root of 8990023639 is about 2079.3149586264.

The spelling of 8990023639 in words is "eight billion, nine hundred ninety million, twenty-three thousand, six hundred thirty-nine".