28974121 has 4 divisors (see below), whose sum is σ = 31608144. Its totient is φ = 26340100.

The previous prime is 28974109. The next prime is 28974139. The reversal of 28974121 is 12147982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28974121 - 2¹⁹ = 28449833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28974151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316995 + ... + 1317016.

It is an arithmetic number, because the mean of its divisors is an integer number (7902036).

Almost surely, 2^28974121 is an apocalyptic number.

It is an amenable number.

28974121 is a deficient number, since it is larger than the sum of its proper divisors (2634023).

28974121 is a wasteful number, since it uses less digits than its factorization.

28974121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634022.

The product of its digits is 8064, while the sum is 34.

The square root of 28974121 is about 5382.7614660135. The cubic root of 28974121 is about 307.1402663049.

The spelling of 28974121 in words is "twenty-eight million, nine hundred seventy-four thousand, one hundred twenty-one".