13040781 has 8 divisors (see below), whose sum is σ = 18725280. Its totient is φ = 8025072.

The previous prime is 13040779. The next prime is 13040789. The reversal of 13040781 is 18704031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13040781 - 2¹ = 13040779 is a prime.

It is a super-2 number, since 2×13040781² = 340123938179922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13040789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167151 + ... + 167228.

It is an arithmetic number, because the mean of its divisors is an integer number (2340660).

Almost surely, 2^13040781 is an apocalyptic number.

It is an amenable number.

13040781 is a deficient number, since it is larger than the sum of its proper divisors (5684499).

13040781 is a wasteful number, since it uses less digits than its factorization.

13040781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334395.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 13040781 is about 3611.2021544079. The cubic root of 13040781 is about 235.3790833504.

The spelling of 13040781 in words is "thirteen million, forty thousand, seven hundred eighty-one".