40781904 has 80 divisors (see below), whose sum is σ = 112284480. Its totient is φ = 12718080.

The previous prime is 40781893. The next prime is 40781911. The reversal of 40781904 is 40918704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88234 + ... + 88694.

It is an arithmetic number, because the mean of its divisors is an integer number (1403556).

Almost surely, 2^40781904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40781904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56142240).

40781904 is an abundant number, since it is smaller than the sum of its proper divisors (71502576).

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

40781904 is a wasteful number, since it uses less digits than its factorization.

40781904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40781904 is about 6386.0710926203. The cubic root of 40781904 is about 344.2092201219.

The spelling of 40781904 in words is "forty million, seven hundred eighty-one thousand, nine hundred four".