240640451 has 2 divisors, whose sum is σ = 240640452. Its totient is φ = 240640450.

The previous prime is 240640447. The next prime is 240640471. The reversal of 240640451 is 154046042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240640451 - 2² = 240640447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240640451.

It is not a weakly prime, because it can be changed into another prime (240640471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120320225 + 120320226.

It is an arithmetic number, because the mean of its divisors is an integer number (120320226).

Almost surely, 2^240640451 is an apocalyptic number.

240640451 is a deficient number, since it is larger than the sum of its proper divisors (1).

240640451 is an equidigital number, since it uses as much as digits as its factorization.

240640451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 240640451 is about 15512.5900803186. The cubic root of 240640451 is about 621.9987963639.

Adding to 240640451 its reverse (154046042), we get a palindrome (394686493).

The spelling of 240640451 in words is "two hundred forty million, six hundred forty thousand, four hundred fifty-one".