9978960838 has 48 divisors (see below), whose sum is σ = 19278851904. Its totient is φ = 3829850640.

The previous prime is 9978960829. The next prime is 9978960847. The reversal of 9978960838 is 8380698799.

It is an interprime number because it is at equal distance from previous prime (9978960829) and next prime (9978960847).

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3145 + ... + 141307.

It is an arithmetic number, because the mean of its divisors is an integer number (401642748).

Almost surely, 2^9978960838 is an apocalyptic number.

9978960838 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

9978960838 is a deficient number, since it is larger than the sum of its proper divisors (9299891066).

9978960838 is a wasteful number, since it uses less digits than its factorization.

9978960838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138257 (or 138250 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 67.

The square root of 9978960838 is about 99894.7488009255. The cubic root of 9978960838 is about 2152.9227124955.

The spelling of 9978960838 in words is "nine billion, nine hundred seventy-eight million, nine hundred sixty thousand, eight hundred thirty-eight".