40405518 has 12 divisors (see below), whose sum is σ = 87545328. Its totient is φ = 13468500.

The previous prime is 40405471. The next prime is 40405529. The reversal of 40405518 is 81550404.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40405491 and 40405500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122358 + ... + 1122393.

It is an arithmetic number, because the mean of its divisors is an integer number (7295444).

Almost surely, 2^40405518 is an apocalyptic number.

40405518 is an abundant number, since it is smaller than the sum of its proper divisors (47139810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40405518 is a wasteful number, since it uses less digits than its factorization.

40405518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244759 (or 2244756 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 40405518 is about 6356.5334892534. The cubic root of 40405518 is about 343.1470157174.

The spelling of 40405518 in words is "forty million, four hundred five thousand, five hundred eighteen".