9978938654 has 8 divisors (see below), whose sum is σ = 15619208400. Its totient is φ = 4772535856.

The previous prime is 9978938653. The next prime is 9978938687. The reversal of 9978938654 is 4568398799.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978938653) 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, 108466679 + ... + 108466770.

It is an arithmetic number, because the mean of its divisors is an integer number (1952401050).

Almost surely, 2^9978938654 is an apocalyptic number.

9978938654 is a deficient number, since it is larger than the sum of its proper divisors (5640269746).

9978938654 is a wasteful number, since it uses less digits than its factorization.

9978938654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216933474.

The product of its digits is 117573120, while the sum is 68.

The square root of 9978938654 is about 99894.6377639961. The cubic root of 9978938654 is about 2152.9211171232.

The spelling of 9978938654 in words is "nine billion, nine hundred seventy-eight million, nine hundred thirty-eight thousand, six hundred fifty-four".