240745639 has 4 divisors (see below), whose sum is σ = 241797160. Its totient is φ = 239694120.

The previous prime is 240745633. The next prime is 240745649. The reversal of 240745639 is 936547042.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 240745639 - 2⁷ = 240745511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240745633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525417 + ... + 525874.

It is an arithmetic number, because the mean of its divisors is an integer number (60449290).

Almost surely, 2^240745639 is an apocalyptic number.

240745639 is a deficient number, since it is larger than the sum of its proper divisors (1051521).

240745639 is a wasteful number, since it uses less digits than its factorization.

240745639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051520.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 240745639 is about 15515.9801172855. The cubic root of 240745639 is about 622.0894118836.

The spelling of 240745639 in words is "two hundred forty million, seven hundred forty-five thousand, six hundred thirty-nine".