9998812639 has 8 divisors (see below), whose sum is σ = 10244025792. Its totient is φ = 9753663360.

The previous prime is 9998812631. The next prime is 9998812673. The reversal of 9998812639 is 9362188999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9998812639 - 2³ = 9998812631 is a prime.

It is a super-2 number, since 2×9998812639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998812631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511642 + ... + 530824.

It is an arithmetic number, because the mean of its divisors is an integer number (1280503224).

Almost surely, 2^9998812639 is an apocalyptic number.

9998812639 is a deficient number, since it is larger than the sum of its proper divisors (245213153).

9998812639 is a wasteful number, since it uses less digits than its factorization.

9998812639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31937.

The product of its digits is 15116544, while the sum is 64.

The square root of 9998812639 is about 99994.0630187613. The cubic root of 9998812639 is about 2154.3494169325.

The spelling of 9998812639 in words is "nine billion, nine hundred ninety-eight million, eight hundred twelve thousand, six hundred thirty-nine".