240681919 has 4 divisors (see below), whose sum is σ = 242890120. Its totient is φ = 238473720.

The previous prime is 240681907. The next prime is 240681983. The reversal of 240681919 is 919186042.

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 240681919 - 2¹¹ = 240679871 is a prime.

It is a super-2 number, since 2×240681919² = 115855572267045122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240681319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103937 + ... + 1104154.

It is an arithmetic number, because the mean of its divisors is an integer number (60722530).

Almost surely, 2^240681919 is an apocalyptic number.

240681919 is a deficient number, since it is larger than the sum of its proper divisors (2208201).

240681919 is a wasteful number, since it uses less digits than its factorization.

240681919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208200.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 240681919 is about 15513.9266144971. The cubic root of 240681919 is about 622.0345226442.

The spelling of 240681919 in words is "two hundred forty million, six hundred eighty-one thousand, nine hundred nineteen".