242142640 has 20 divisors (see below), whose sum is σ = 562981824. Its totient is φ = 96857024.

The previous prime is 242142629. The next prime is 242142661. The reversal of 242142640 is 46241242.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

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, 1513312 + ... + 1513471.

Almost surely, 2^242142640 is an apocalyptic number.

242142640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242142640 is an abundant number, since it is smaller than the sum of its proper divisors (320839184).

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

242142640 is a wasteful number, since it uses less digits than its factorization.

242142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026796 (or 3026790 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 242142640 is about 15560.9331339737. The cubic root of 242142640 is about 623.2903805863.

Adding to 242142640 its reverse (46241242), we get a palindrome (288383882).

The spelling of 242142640 in words is "two hundred forty-two million, one hundred forty-two thousand, six hundred forty".