40005478 has 4 divisors (see below), whose sum is σ = 60008220. Its totient is φ = 20002738.

The previous prime is 40005467. The next prime is 40005479. The reversal of 40005478 is 87450004.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40005479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001368 + ... + 10001371.

It is an arithmetic number, because the mean of its divisors is an integer number (15002055).

Almost surely, 2^40005478 is an apocalyptic number.

40005478 is a deficient number, since it is larger than the sum of its proper divisors (20002742).

40005478 is a wasteful number, since it uses less digits than its factorization.

40005478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002741.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 40005478 is about 6324.9883794360. The cubic root of 40005478 is about 342.0108007031.

The spelling of 40005478 in words is "forty million, five thousand, four hundred seventy-eight".