242120520 has 48 divisors (see below), whose sum is σ = 786892860. Its totient is φ = 64565376.

The previous prime is 242120503. The next prime is 242120531. The reversal of 242120520 is 25021242.

242120520 is a `hidden beast` number, since 24 + 2 + 120 + 520 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 239816196 + 2304324 = 15486^2 + 1518^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 242120493 and 242120502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335919 + ... + 336638.

Almost surely, 2^242120520 is an apocalyptic number.

242120520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242120520 is an abundant number, since it is smaller than the sum of its proper divisors (544772340).

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

242120520 is a wasteful number, since it uses less digits than its factorization.

242120520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672574 (or 672567 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 242120520 is about 15560.2223634497. Note that the first 3 decimals coincide. The cubic root of 242120520 is about 623.2714005848.

Adding to 242120520 its reverse (25021242), we get a palindrome (267141762).

The spelling of 242120520 in words is "two hundred forty-two million, one hundred twenty thousand, five hundred twenty".