240123513 has 16 divisors (see below), whose sum is σ = 370016640. Its totient is φ = 135670656.

The previous prime is 240123449. The next prime is 240123529. The reversal of 240123513 is 315321042.

It is not a de Polignac number, because 240123513 - 2⁶ = 240123449 is a prime.

It is a super-2 number, since 2×240123513² = 115318602990922338, which contains 22 as substring.

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 240123513.

It is not an unprimeable number, because it can be changed into a prime (240123553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62370 + ... + 66107.

It is an arithmetic number, because the mean of its divisors is an integer number (23126040).

Almost surely, 2^240123513 is an apocalyptic number.

It is an amenable number.

240123513 is a deficient number, since it is larger than the sum of its proper divisors (129893127).

240123513 is a wasteful number, since it uses less digits than its factorization.

240123513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128576.

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

The square root of 240123513 is about 15495.9192370120. The cubic root of 240123513 is about 621.5530894660.

Adding to 240123513 its reverse (315321042), we get a palindrome (555444555).

It can be divided in two parts, 240 and 123513, that added together give a triangular number (123753 = T₄₉₇).

The spelling of 240123513 in words is "two hundred forty million, one hundred twenty-three thousand, five hundred thirteen".