1345224442 has 4 divisors (see below), whose sum is σ = 2017836666. Its totient is φ = 672612220.

The previous prime is 1345224431. The next prime is 1345224457. The reversal of 1345224442 is 2444225431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2444225431 = 5783 ⋅422657.

It can be written as a sum of positive squares in only one way, i.e., 1179304281 + 165920161 = 34341^2 + 12881^2 .

It is a super-2 number, since 2×1345224442² = 3619257598708422728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336306109 + ... + 336306112.

Almost surely, 2^1345224442 is an apocalyptic number.

1345224442 is a deficient number, since it is larger than the sum of its proper divisors (672612224).

1345224442 is an equidigital number, since it uses as much as digits as its factorization.

1345224442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672612223.

The product of its digits is 30720, while the sum is 31.

The square root of 1345224442 is about 36677.3014547145. The cubic root of 1345224442 is about 1103.9047020284.

Adding to 1345224442 its reverse (2444225431), we get a palindrome (3789449873).

The spelling of 1345224442 in words is "one billion, three hundred forty-five million, two hundred twenty-four thousand, four hundred forty-two".