1331947320 has 128 divisors (see below), whose sum is σ = 4465601280. Its totient is φ = 315008000.

The previous prime is 1331947303. The next prime is 1331947321. The reversal of 1331947320 is 237491331.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331947321) 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, 41815 + ... + 66425.

It is an arithmetic number, because the mean of its divisors is an integer number (34887510).

Almost surely, 2^1331947320 is an apocalyptic number.

1331947320 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 1331947320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232800640).

1331947320 is an abundant number, since it is smaller than the sum of its proper divisors (3133653960).

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

1331947320 is a wasteful number, since it uses less digits than its factorization.

1331947320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24677 (or 24673 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 1331947320 is about 36495.8534630991. The cubic root of 1331947320 is about 1100.2609078076.

The spelling of 1331947320 in words is "one billion, three hundred thirty-one million, nine hundred forty-seven thousand, three hundred twenty".