40478861 has 4 divisors (see below), whose sum is σ = 40552092. Its totient is φ = 40405632.

The previous prime is 40478831. The next prime is 40478899. The reversal of 40478861 is 16887404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10118761 + 30360100 = 3181^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 40478861 - 2¹⁸ = 40216717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40478831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35780 + ... + 36893.

It is an arithmetic number, because the mean of its divisors is an integer number (10138023).

Almost surely, 2^40478861 is an apocalyptic number.

It is an amenable number.

40478861 is a deficient number, since it is larger than the sum of its proper divisors (73231).

40478861 is an equidigital number, since it uses as much as digits as its factorization.

40478861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73230.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 40478861 is about 6362.2999772095. The cubic root of 40478861 is about 343.3545139372.

The spelling of 40478861 in words is "forty million, four hundred seventy-eight thousand, eight hundred sixty-one".