1331942820 has 96 divisors (see below), whose sum is σ = 4036972800. Its totient is φ = 326177280.

The previous prime is 1331942813. The next prime is 1331942837. The reversal of 1331942820 is 282491331.

1331942820 is nontrivially palindromic in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150930 + ... + 159510.

It is an arithmetic number, because the mean of its divisors is an integer number (42051800).

Almost surely, 2^1331942820 is an apocalyptic number.

1331942820 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 1331942820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018486400).

1331942820 is an abundant number, since it is smaller than the sum of its proper divisors (2705029980).

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

1331942820 is a wasteful number, since it uses less digits than its factorization.

1331942820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8805 (or 8803 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1331942820 is about 36495.7918122076. The cubic root of 1331942820 is about 1100.2596687247.

The spelling of 1331942820 in words is "one billion, three hundred thirty-one million, nine hundred forty-two thousand, eight hundred twenty".