40747840 has 56 divisors (see below), whose sum is σ = 110898432. Its totient is φ = 13969920.

The previous prime is 40747829. The next prime is 40747843. The reversal of 40747840 is 4874704.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 40747796 and 40747805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40747843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6856 + ... + 11335.

Almost surely, 2^40747840 is an apocalyptic number.

40747840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40747840 is an abundant number, since it is smaller than the sum of its proper divisors (70150592).

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

40747840 is a wasteful number, since it uses less digits than its factorization.

40747840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18215 (or 18205 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 40747840 is about 6383.4034809026. The cubic root of 40747840 is about 344.1133572693.

The spelling of 40747840 in words is "forty million, seven hundred forty-seven thousand, eight hundred forty".