27890121 has 8 divisors (see below), whose sum is σ = 42499264. Its totient is φ = 15937200.

The previous prime is 27890117. The next prime is 27890123. The reversal of 27890121 is 12109872.

27890121 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 27890121 - 2² = 27890117 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27890123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664030 + ... + 664071.

It is an arithmetic number, because the mean of its divisors is an integer number (5312408).

Almost surely, 2^27890121 is an apocalyptic number.

27890121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27890121 is a deficient number, since it is larger than the sum of its proper divisors (14609143).

27890121 is a wasteful number, since it uses less digits than its factorization.

27890121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328111.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 27890121 is about 5281.1098265421. The cubic root of 27890121 is about 303.2611653241.

Adding to 27890121 its reverse (12109872), we get a palindrome (39999993).

The spelling of 27890121 in words is "twenty-seven million, eight hundred ninety thousand, one hundred twenty-one".