1520444242 has 4 divisors (see below), whose sum is σ = 2280666366. Its totient is φ = 760222120.

The previous prime is 1520444207. The next prime is 1520444243. The reversal of 1520444242 is 2424440251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2424440251 = 1013 ⋅2393327.

It can be written as a sum of positive squares in only one way, i.e., 1411429761 + 109014481 = 37569^2 + 10441^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1520444242.

It is not an unprimeable number, because it can be changed into a prime (1520444243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380111059 + ... + 380111062.

Almost surely, 2^1520444242 is an apocalyptic number.

1520444242 is a deficient number, since it is larger than the sum of its proper divisors (760222124).

1520444242 is an equidigital number, since it uses as much as digits as its factorization.

1520444242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760222123.

The product of its (nonzero) digits is 10240, while the sum is 28.

The square root of 1520444242 is about 38992.8742464569. The cubic root of 1520444242 is about 1149.8914181035.

Adding to 1520444242 its reverse (2424440251), we get a palindrome (3944884493).

The spelling of 1520444242 in words is "one billion, five hundred twenty million, four hundred forty-four thousand, two hundred forty-two".