240305138 has 4 divisors (see below), whose sum is σ = 360457710. Its totient is φ = 120152568.

The previous prime is 240305137. The next prime is 240305147. The reversal of 240305138 is 831503042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 169963369 + 70341769 = 13037^2 + 8387^2 .

It is not an unprimeable number, because it can be changed into a prime (240305137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60076283 + ... + 60076286.

Almost surely, 2^240305138 is an apocalyptic number.

240305138 is a deficient number, since it is larger than the sum of its proper divisors (120152572).

240305138 is a wasteful number, since it uses less digits than its factorization.

240305138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120152571.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 240305138 is about 15501.7785431221. The cubic root of 240305138 is about 621.7097604057.

The spelling of 240305138 in words is "two hundred forty million, three hundred five thousand, one hundred thirty-eight".