12153440 has 48 divisors (see below), whose sum is σ = 30926448. Its totient is φ = 4486656.

The previous prime is 12153397. The next prime is 12153451. The reversal of 12153440 is 4435121.

12153440 = 400² + 401² + ... + 464².

It is a super-2 number, since 2×12153440² = 295412207667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842 + ... + 5001.

It is an arithmetic number, because the mean of its divisors is an integer number (644301).

Almost surely, 2^12153440 is an apocalyptic number.

12153440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12153440 is an abundant number, since it is smaller than the sum of its proper divisors (18773008).

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

12153440 is a wasteful number, since it uses less digits than its factorization.

12153440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871 (or 5863 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12153440 is about 3486.1784234316. The cubic root of 12153440 is about 229.9145240037.

Adding to 12153440 its reverse (4435121), we get a palindrome (16588561).

The spelling of 12153440 in words is "twelve million, one hundred fifty-three thousand, four hundred forty".