27145409 has 4 divisors (see below), whose sum is σ = 27202560. Its totient is φ = 27088260.

The previous prime is 27145397. The next prime is 27145411. The reversal of 27145409 is 90454172.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-27145409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27145499) 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, 27857 + ... + 28814.

It is an arithmetic number, because the mean of its divisors is an integer number (6800640).

Almost surely, 2^27145409 is an apocalyptic number.

It is an amenable number.

27145409 is a deficient number, since it is larger than the sum of its proper divisors (57151).

27145409 is an equidigital number, since it uses as much as digits as its factorization.

27145409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57150.

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

The square root of 27145409 is about 5210.1256222859. The cubic root of 27145409 is about 300.5375879405.

The spelling of 27145409 in words is "twenty-seven million, one hundred forty-five thousand, four hundred nine".