1382721220 has 12 divisors (see below), whose sum is σ = 2903714604. Its totient is φ = 553088480.

The previous prime is 1382721217. The next prime is 1382721229. The reversal of 1382721220 is 221272831.

It can be written as a sum of positive squares in 2 ways, for example, as 758121156 + 624600064 = 27534^2 + 24992^2 .

It is a super-3 number, since 3×1382721220³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1382721229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34568011 + ... + 34568050.

It is an arithmetic number, because the mean of its divisors is an integer number (241976217).

Almost surely, 2^1382721220 is an apocalyptic number.

1382721220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1382721220 is an abundant number, since it is smaller than the sum of its proper divisors (1520993384).

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

1382721220 is a wasteful number, since it uses less digits than its factorization.

1382721220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69136070 (or 69136068 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1382721220 is about 37184.9595939003. The cubic root of 1382721220 is about 1114.0675964384.

The spelling of 1382721220 in words is "one billion, three hundred eighty-two million, seven hundred twenty-one thousand, two hundred twenty".