240312513 has 48 divisors (see below), whose sum is σ = 395808000. Its totient is φ = 128949408.

The previous prime is 240312511. The next prime is 240312577. The reversal of 240312513 is 315213042.

It is not a de Polignac number, because 240312513 - 2¹ = 240312511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 240312513.

It is not an unprimeable number, because it can be changed into a prime (240312511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387918 + ... + 388536.

It is an arithmetic number, because the mean of its divisors is an integer number (8246000).

Almost surely, 2^240312513 is an apocalyptic number.

It is an amenable number.

240312513 is a deficient number, since it is larger than the sum of its proper divisors (155495487).

240312513 is a wasteful number, since it uses less digits than its factorization.

240312513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 240312513 is about 15502.0164172278. The cubic root of 240312513 is about 621.7161204620.

Adding to 240312513 its reverse (315213042), we get a palindrome (555525555).

The spelling of 240312513 in words is "two hundred forty million, three hundred twelve thousand, five hundred thirteen".