121928 has 8 divisors (see below), whose sum is σ = 228630. Its totient is φ = 60960.

The previous prime is 121921. The next prime is 121931. The reversal of 121928 is 829121.

It can be written as a sum of positive squares in only one way, i.e., 88804 + 33124 = 298^2 + 182^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (121921) by changing a digit.

121928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7613 + ... + 7628.

2¹²¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

121928 is a deficient number, since it is larger than the sum of its proper divisors (106702).

121928 is a wasteful number, since it uses less digits than its factorization.

121928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15247 (or 15243 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 121928 is about 349.1819010201. The cubic root of 121928 is about 49.5869979794.

The spelling of 121928 in words is "one hundred twenty-one thousand, nine hundred twenty-eight".