121698918 has 48 divisors (see below), whose sum is σ = 293104656. Its totient is φ = 36179520.

The previous prime is 121698851. The next prime is 121698919. The reversal of 121698918 is 819896121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121698919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4696 + ... + 16292.

It is an arithmetic number, because the mean of its divisors is an integer number (6106347).

Almost surely, 2^121698918 is an apocalyptic number.

121698918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121698918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146552328).

121698918 is an abundant number, since it is smaller than the sum of its proper divisors (171405738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121698918 is a wasteful number, since it uses less digits than its factorization.

121698918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11669 (or 11666 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 121698918 is about 11031.7232561373. The cubic root of 121698918 is about 495.5592332802.

The spelling of 121698918 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, nine hundred eighteen".