121698 has 12 divisors (see below), whose sum is σ = 263718. Its totient is φ = 40560.

The previous prime is 121697. The next prime is 121711. The reversal of 121698 is 896121.

It can be written as a sum of positive squares in only one way, i.e., 88209 + 33489 = 297^2 + 183^2 .

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121698.

It is not an unprimeable number, because it can be changed into a prime (121697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3363 + ... + 3398.

2¹²¹⁶⁹⁸ is an apocalyptic number.

121698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121698 is an abundant number, since it is smaller than the sum of its proper divisors (142020).

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

121698 is a wasteful number, since it uses less digits than its factorization.

121698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769 (or 6766 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 121698 is about 348.8524043202. The cubic root of 121698 is about 49.5557987242. Note that the first 3 decimals are identical.

The spelling of 121698 in words is "one hundred twenty-one thousand, six hundred ninety-eight".