1045220042 has 4 divisors (see below), whose sum is σ = 1567830066. Its totient is φ = 522610020.

The previous prime is 1045220041. The next prime is 1045220047. The reversal of 1045220042 is 2400225401.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 828806521 + 216413521 = 28789^2 + 14711^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1045219996 and 1045220023.

It is not an unprimeable number, because it can be changed into a prime (1045220041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261305009 + ... + 261305012.

Almost surely, 2^1045220042 is an apocalyptic number.

1045220042 is a deficient number, since it is larger than the sum of its proper divisors (522610024).

1045220042 is an equidigital number, since it uses as much as digits as its factorization.

1045220042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522610023.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1045220042 is about 32329.8630062053. The cubic root of 1045220042 is about 1014.8516828911.

Adding to 1045220042 its reverse (2400225401), we get a palindrome (3445445443).

The spelling of 1045220042 in words is "one billion, forty-five million, two hundred twenty thousand, forty-two".