40478317 has 4 divisors (see below), whose sum is σ = 44158176. Its totient is φ = 36798460.

The previous prime is 40478311. The next prime is 40478323. The reversal of 40478317 is 71387404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40478311) and next prime (40478323).

It is a cyclic number.

It is not a de Polignac number, because 40478317 - 2¹⁵ = 40445549 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 (40478311) 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, 1839913 + ... + 1839934.

It is an arithmetic number, because the mean of its divisors is an integer number (11039544).

Almost surely, 2^40478317 is an apocalyptic number.

It is an amenable number.

40478317 is a deficient number, since it is larger than the sum of its proper divisors (3679859).

40478317 is a wasteful number, since it uses less digits than its factorization.

40478317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679858.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 40478317 is about 6362.2572252307. The cubic root of 40478317 is about 343.3529758036.

The spelling of 40478317 in words is "forty million, four hundred seventy-eight thousand, three hundred seventeen".