40878513 has 20 divisors (see below), whose sum is σ = 65764468. Its totient is φ = 25155360.

The previous prime is 40878511. The next prime is 40878527. The reversal of 40878513 is 31587804.

It can be written as a sum of positive squares in 2 ways, for example, as 14837904 + 26040609 = 3852^2 + 5103^2 .

It is not a de Polignac number, because 40878513 - 2¹ = 40878511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40878511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18358 + ... + 20463.

Almost surely, 2^40878513 is an apocalyptic number.

It is an amenable number.

40878513 is a deficient number, since it is larger than the sum of its proper divisors (24885955).

40878513 is a wasteful number, since it uses less digits than its factorization.

40878513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38846 (or 38837 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 40878513 is about 6393.6306587103. The cubic root of 40878513 is about 344.4808069562.

The spelling of 40878513 in words is "forty million, eight hundred seventy-eight thousand, five hundred thirteen".