242640442 has 16 divisors (see below), whose sum is σ = 402076800. Its totient is φ = 108894240.

The previous prime is 242640397. The next prime is 242640491. The reversal of 242640442 is 244046242.

It is a self number, because there is not a number n which added to its sum of digits gives 242640442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68067 + ... + 71542.

It is an arithmetic number, because the mean of its divisors is an integer number (25129800).

Almost surely, 2^242640442 is an apocalyptic number.

242640442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

242640442 is a deficient number, since it is larger than the sum of its proper divisors (159436358).

242640442 is a wasteful number, since it uses less digits than its factorization.

242640442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139701.

The product of its (nonzero) digits is 12288, while the sum is 28.

The square root of 242640442 is about 15576.9201705600. The cubic root of 242640442 is about 623.7172127724.

Adding to 242640442 its reverse (244046242), we get a palindrome (486686684).

The spelling of 242640442 in words is "two hundred forty-two million, six hundred forty thousand, four hundred forty-two".