121860 has 36 divisors (see below), whose sum is σ = 370188. Its totient is φ = 32448.

The previous prime is 121853. The next prime is 121867. The reversal of 121860 is 68121.

It is an interprime number because it is at equal distance from previous prime (121853) and next prime (121867).

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 28224 = 306^2 + 168^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (10283).

2¹²¹⁸⁶⁰ is an apocalyptic number.

121860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121860 is an abundant number, since it is smaller than the sum of its proper divisors (248328).

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

121860 is a wasteful number, since it uses less digits than its factorization.

121860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121860 is about 349.0845169869. The cubic root of 121860 is about 49.5777779400.

Adding to 121860 its reverse (68121), we get a palindrome (189981).

The spelling of 121860 in words is "one hundred twenty-one thousand, eight hundred sixty".