40478515 has 32 divisors (see below), whose sum is σ = 61876224. Its totient is φ = 24685440.

The previous prime is 40478497. The next prime is 40478527. The reversal of 40478515 is 51587404.

It is not a de Polignac number, because 40478515 - 2⁷ = 40478387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16977 + ... + 19213.

It is an arithmetic number, because the mean of its divisors is an integer number (1933632).

Almost surely, 2^40478515 is an apocalyptic number.

40478515 is a deficient number, since it is larger than the sum of its proper divisors (21397709).

40478515 is a wasteful number, since it uses less digits than its factorization.

40478515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 40478515 is about 6362.2727857268. The cubic root of 40478515 is about 343.3535356406.

Subtracting 40478515 from its reverse (51587404), we obtain a square (11108889 = 3333²).

The spelling of 40478515 in words is "forty million, four hundred seventy-eight thousand, five hundred fifteen".