40655440 has 80 divisors (see below), whose sum is σ = 113742720. Its totient is φ = 13201920.

The previous prime is 40655437. The next prime is 40655441. The reversal of 40655440 is 4455604.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 40655399 and 40655408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40655441) 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 15 ways as a sum of consecutive naturals, for example, 8730 + ... + 12550.

It is an arithmetic number, because the mean of its divisors is an integer number (1421784).

Almost surely, 2^40655440 is an apocalyptic number.

40655440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40655440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56871360).

40655440 is an abundant number, since it is smaller than the sum of its proper divisors (73087280).

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

40655440 is a wasteful number, since it uses less digits than its factorization.

40655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3854 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 40655440 is about 6376.1618549093. The cubic root of 40655440 is about 343.8530560429.

The spelling of 40655440 in words is "forty million, six hundred fifty-five thousand, four hundred forty".