27840397 has 4 divisors (see below), whose sum is σ = 29981980. Its totient is φ = 25698816.

The previous prime is 27840367. The next prime is 27840413. The reversal of 27840397 is 79304872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10023556 + 17816841 = 3166^2 + 4221^2 .

It is not a de Polignac number, because 27840397 - 2¹⁵ = 27807629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27840367) 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, 1070772 + ... + 1070797.

It is an arithmetic number, because the mean of its divisors is an integer number (7495495).

Almost surely, 2^27840397 is an apocalyptic number.

It is an amenable number.

27840397 is a deficient number, since it is larger than the sum of its proper divisors (2141583).

27840397 is a wasteful number, since it uses less digits than its factorization.

27840397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141582.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 27840397 is about 5276.4000037905. The cubic root of 27840397 is about 303.0808347033.

The spelling of 27840397 in words is "twenty-seven million, eight hundred forty thousand, three hundred ninety-seven".