27397440 has 280 divisors, whose sum is σ = 112117632. Its totient is φ = 6220800.

The previous prime is 27397429. The next prime is 27397441. The reversal of 27397440 is 4479372.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 27397395 and 27397404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27397441) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 181365 + ... + 181515.

Almost surely, 2^27397440 is an apocalyptic number.

27397440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27397440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56058816).

27397440 is an abundant number, since it is smaller than the sum of its proper divisors (84720192).

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

27397440 is a wasteful number, since it uses less digits than its factorization.

27397440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 27397440 is about 5234.2563941786. The cubic root of 27397440 is about 301.4648358782.

The spelling of 27397440 in words is "twenty-seven million, three hundred ninety-seven thousand, four hundred forty".