1142381220 has 72 divisors (see below), whose sum is σ = 3230782464. Its totient is φ = 301606464.

The previous prime is 1142381189. The next prime is 1142381243. The reversal of 1142381220 is 221832411.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 686109 + ... + 687771.

Almost surely, 2^1142381220 is an apocalyptic number.

1142381220 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 1142381220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1615391232).

1142381220 is an abundant number, since it is smaller than the sum of its proper divisors (2088401244).

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

1142381220 is a wasteful number, since it uses less digits than its factorization.

1142381220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889 (or 1780 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1142381220 is about 33799.1304621879. The cubic root of 1142381220 is about 1045.3707680636.

The spelling of 1142381220 in words is "one billion, one hundred forty-two million, three hundred eighty-one thousand, two hundred twenty".