1042243220 has 12 divisors (see below), whose sum is σ = 2188710804. Its totient is φ = 416897280.

The previous prime is 1042243211. The next prime is 1042243231. The reversal of 1042243220 is 223422401.

It can be written as a sum of positive squares in 2 ways, for example, as 476374276 + 565868944 = 21826^2 + 23788^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 52112161 = 1042243220 / (1 + 0 + 4 + 2 + 2 + 4 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1042243192 and 1042243201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26056061 + ... + 26056100.

It is an arithmetic number, because the mean of its divisors is an integer number (182392567).

Almost surely, 2^1042243220 is an apocalyptic number.

1042243220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1042243220 is an abundant number, since it is smaller than the sum of its proper divisors (1146467584).

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

1042243220 is a wasteful number, since it uses less digits than its factorization.

1042243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52112170 (or 52112168 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1042243220 is about 32283.7919086343. The cubic root of 1042243220 is about 1013.8873228385.

Adding to 1042243220 its reverse (223422401), we get a palindrome (1265665621).

The spelling of 1042243220 in words is "one billion, forty-two million, two hundred forty-three thousand, two hundred twenty".