1327121520 has 40 divisors (see below), whose sum is σ = 4114077456. Its totient is φ = 353899008.

The previous prime is 1327121489. The next prime is 1327121527. The reversal of 1327121520 is 251217231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1327121520² = 3522503057694220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327121527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764597 + ... + 2765076.

Almost surely, 2^1327121520 is an apocalyptic number.

1327121520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1327121520 is an abundant number, since it is smaller than the sum of its proper divisors (2786955936).

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

1327121520 is a wasteful number, since it uses less digits than its factorization.

1327121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529689 (or 5529683 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1327121520 is about 36429.6791092098. The cubic root of 1327121520 is about 1098.9305087176.

Adding to 1327121520 its reverse (251217231), we get a palindrome (1578338751).

The spelling of 1327121520 in words is "one billion, three hundred twenty-seven million, one hundred twenty-one thousand, five hundred twenty".