28140121 has 8 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 25739280.

The previous prime is 28140097. The next prime is 28140131. The reversal of 28140121 is 12104182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28140121 - 2⁵ = 28140089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (28140131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24985 + ... + 26086.

It is an arithmetic number, because the mean of its divisors is an integer number (3830400).

Almost surely, 2^28140121 is an apocalyptic number.

It is an amenable number.

28140121 is a deficient number, since it is larger than the sum of its proper divisors (2503079).

28140121 is a wasteful number, since it uses less digits than its factorization.

28140121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51119.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 28140121 is about 5304.7262888862. The cubic root of 28140121 is about 304.1645901487.

The spelling of 28140121 in words is "twenty-eight million, one hundred forty thousand, one hundred twenty-one".