13405215240 has 48 divisors (see below), whose sum is σ = 43566950700. Its totient is φ = 3574723968.

The previous prime is 13405215233. The next prime is 13405215253. The reversal of 13405215240 is 4251250431.

13405215240 is a `hidden beast` number, since 1 + 3 + 405 + 2 + 15 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13255837956 + 149377284 = 115134^2 + 12222^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18617995 + ... + 18618714.

Almost surely, 2^13405215240 is an apocalyptic number.

13405215240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13405215240 is an abundant number, since it is smaller than the sum of its proper divisors (30161735460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13405215240 is a wasteful number, since it uses less digits than its factorization.

13405215240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37236726 (or 37236719 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 13405215240 its reverse (4251250431), we get a palindrome (17656465671).

The spelling of 13405215240 in words is "thirteen billion, four hundred five million, two hundred fifteen thousand, two hundred forty".