240728731 has 2 divisors, whose sum is σ = 240728732. Its totient is φ = 240728730.

The previous prime is 240728711. The next prime is 240728743. The reversal of 240728731 is 137827042.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 240728731 - 2¹¹ = 240726683 is a prime.

It is a super-2 number, since 2×240728731² = 115900643857740722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (240728701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120364365 + 120364366.

It is an arithmetic number, because the mean of its divisors is an integer number (120364366).

Almost surely, 2^240728731 is an apocalyptic number.

240728731 is a deficient number, since it is larger than the sum of its proper divisors (1).

240728731 is an equidigital number, since it uses as much as digits as its factorization.

240728731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 240728731 is about 15515.4352500985. The cubic root of 240728731 is about 622.0748480559.

The spelling of 240728731 in words is "two hundred forty million, seven hundred twenty-eight thousand, seven hundred thirty-one".