1215040120 has 128 divisors (see below), whose sum is σ = 3303244800. Its totient is φ = 392933376.

The previous prime is 1215040103. The next prime is 1215040129. The reversal of 1215040120 is 210405121.

It is a super-2 number, since 2×1215040120² = 2952644986419228800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215040094 and 1215040103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215040129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1877637 + ... + 1878283.

It is an arithmetic number, because the mean of its divisors is an integer number (25806600).

Almost surely, 2^1215040120 is an apocalyptic number.

1215040120 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 1215040120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651622400).

1215040120 is an abundant number, since it is smaller than the sum of its proper divisors (2088204680).

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

1215040120 is a wasteful number, since it uses less digits than its factorization.

1215040120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1215040120 is about 34857.4256077525. The cubic root of 1215040120 is about 1067.0797362844.

Adding to 1215040120 its reverse (210405121), we get a palindrome (1425445241).

The spelling of 1215040120 in words is "one billion, two hundred fifteen million, forty thousand, one hundred twenty".