12097540 has 144 divisors (see below), whose sum is σ = 34659072. Its totient is φ = 3446784.

The previous prime is 12097531. The next prime is 12097543. The reversal of 12097540 is 4579021.

12097540 = 52² + 53² + ... + 331².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 12097499 and 12097508.

It is not an unprimeable number, because it can be changed into a prime (12097543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 525969 + ... + 525991.

It is an arithmetic number, because the mean of its divisors is an integer number (240688).

Almost surely, 2^12097540 is an apocalyptic number.

12097540 is a gapful number since it is divisible by the number (10) 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 12097540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17329536).

12097540 is an abundant number, since it is smaller than the sum of its proper divisors (22561532).

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

12097540 is a wasteful number, since it uses less digits than its factorization.

12097540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 12097540 is about 3478.1518080728. The cubic root of 12097540 is about 229.5614832985.

The spelling of 12097540 in words is "twelve million, ninety-seven thousand, five hundred forty".