1142440220 has 24 divisors (see below), whose sum is σ = 2428033104. Its totient is φ = 451469696.

The previous prime is 1142440219. The next prime is 1142440279. The reversal of 1142440220 is 220442411.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1142440192 and 1142440201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342449 + ... + 345768.

It is an arithmetic number, because the mean of its divisors is an integer number (101168046).

Almost surely, 2^1142440220 is an apocalyptic number.

1142440220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142440220 is an abundant number, since it is smaller than the sum of its proper divisors (1285592884).

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

1142440220 is a wasteful number, since it uses less digits than its factorization.

1142440220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688309 (or 688307 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1142440220 is about 33800.0032544377. The cubic root of 1142440220 is about 1045.3887643368.

Adding to 1142440220 its reverse (220442411), we get a palindrome (1362882631).

The spelling of 1142440220 in words is "one billion, one hundred forty-two million, four hundred forty thousand, two hundred twenty".