121640 has 16 divisors (see below), whose sum is σ = 273780. Its totient is φ = 48640.

The previous prime is 121637. The next prime is 121661. The reversal of 121640 is 46121.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 7396 = 338^2 + 86^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481 + ... + 1560.

2¹²¹⁶⁴⁰ is an apocalyptic number.

121640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121640 is an abundant number, since it is smaller than the sum of its proper divisors (152140).

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

121640 is a wasteful number, since it uses less digits than its factorization.

121640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3048 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121640 is about 348.7692647009. The cubic root of 121640 is about 49.5479248806.

Adding to 121640 its reverse (46121), we get a palindrome (167761).

The spelling of 121640 in words is "one hundred twenty-one thousand, six hundred forty".