40784478 has 32 divisors (see below), whose sum is σ = 94755840. Its totient is φ = 11460960.

The previous prime is 40784477. The next prime is 40784501. The reversal of 40784478 is 87448704.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40784477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5398 + ... + 10521.

It is an arithmetic number, because the mean of its divisors is an integer number (2961120).

Almost surely, 2^40784478 is an apocalyptic number.

40784478 is an abundant number, since it is smaller than the sum of its proper divisors (53971362).

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

40784478 is a wasteful number, since it uses less digits than its factorization.

40784478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15992.

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 40784478 is about 6386.2726218037. The cubic root of 40784478 is about 344.2164616989.

The spelling of 40784478 in words is "forty million, seven hundred eighty-four thousand, four hundred seventy-eight".