27425921 has 4 divisors (see below), whose sum is σ = 27436500. Its totient is φ = 27415344.

The previous prime is 27425897. The next prime is 27425927. The reversal of 27425921 is 12952472.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23280625 + 4145296 = 4825^2 + 2036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27425921 is a prime.

It is a super-2 number, since 2×27425921² = 1504362285396482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27425927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (6859125).

Almost surely, 2^27425921 is an apocalyptic number.

It is an amenable number.

27425921 is a deficient number, since it is larger than the sum of its proper divisors (10579).

27425921 is an equidigital number, since it uses as much as digits as its factorization.

27425921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10578.

The product of its digits is 10080, while the sum is 32.

The square root of 27425921 is about 5236.9763222684. The cubic root of 27425921 is about 301.5692622590.

The spelling of 27425921 in words is "twenty-seven million, four hundred twenty-five thousand, nine hundred twenty-one".