27398920 has 16 divisors (see below), whose sum is σ = 61647660. Its totient is φ = 10959552.

The previous prime is 27398897. The next prime is 27398923. The reversal of 27398920 is 2989372.

It can be written as a sum of positive squares in 2 ways, for example, as 27227524 + 171396 = 5218^2 + 414^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 684973 = 27398920 / (2 + 7 + 3 + 9 + 8 + 9 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (27398923) 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, 342447 + ... + 342526.

Almost surely, 2^27398920 is an apocalyptic number.

27398920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27398920 is an abundant number, since it is smaller than the sum of its proper divisors (34248740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27398920 is a wasteful number, since it uses less digits than its factorization.

27398920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684984 (or 684980 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 27398920 is about 5234.3977686072. The cubic root of 27398920 is about 301.4702641216.

The spelling of 27398920 in words is "twenty-seven million, three hundred ninety-eight thousand, nine hundred twenty".