242838409 has 6 divisors (see below), whose sum is σ = 266921690. Its totient is φ = 220762080.

The previous prime is 242838403. The next prime is 242838419. The reversal of 242838409 is 904838242.

It can be written as a sum of positive squares in only one way, i.e., 126630009 + 116208400 = 11253^2 + 10780^2 .

It is not a de Polignac number, because 242838409 - 2¹⁷ = 242707337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242838403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1003344 + ... + 1003585.

Almost surely, 2^242838409 is an apocalyptic number.

It is an amenable number.

242838409 is a deficient number, since it is larger than the sum of its proper divisors (24083281).

242838409 is a wasteful number, since it uses less digits than its factorization.

242838409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006951 (or 2006940 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 242838409 is about 15583.2733724337. The cubic root of 242838409 is about 623.8867940934.

The spelling of 242838409 in words is "two hundred forty-two million, eight hundred thirty-eight thousand, four hundred nine".