27791397 has 16 divisors (see below), whose sum is σ = 41352960. Its totient is φ = 18446400.

The previous prime is 27791389. The next prime is 27791411. The reversal of 27791397 is 79319772.

It is not a de Polignac number, because 27791397 - 2³ = 27791389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27791347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4372 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (2584560).

Almost surely, 2^27791397 is an apocalyptic number.

27791397 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

27791397 is a deficient number, since it is larger than the sum of its proper divisors (13561563).

27791397 is a wasteful number, since it uses less digits than its factorization.

27791397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521 (or 4515 counting only the distinct ones).

The product of its digits is 166698, while the sum is 45.

The square root of 27791397 is about 5271.7546414832. The cubic root of 27791397 is about 302.9029195901.

The spelling of 27791397 in words is "twenty-seven million, seven hundred ninety-one thousand, three hundred ninety-seven".