12151620 has 120 divisors (see below), whose sum is σ = 41123544. Its totient is φ = 2985984.

The previous prime is 12151603. The next prime is 12151637. The reversal of 12151620 is 2615121.

12151620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12151603) and next prime (12151637).

It can be written as a sum of positive squares in 4 ways, for example, as 2566404 + 9585216 = 1602^2 + 3096^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12151593 and 12151602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20772 + ... + 21348.

Almost surely, 2^12151620 is an apocalyptic number.

12151620 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 12151620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20561772).

12151620 is an abundant number, since it is smaller than the sum of its proper divisors (28971924).

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

12151620 is a wasteful number, since it uses less digits than its factorization.

12151620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12151620 is about 3485.9173828420. The cubic root of 12151620 is about 229.9030467231.

Adding to 12151620 its reverse (2615121), we get a palindrome (14766741).

The spelling of 12151620 in words is "twelve million, one hundred fifty-one thousand, six hundred twenty".