40065840 has 160 divisors (see below), whose sum is σ = 140318400. Its totient is φ = 10637568.

The previous prime is 40065803. The next prime is 40065841. The reversal of 40065840 is 4856004.

40065840 is a `hidden beast` number, since 4 + 0 + 0 + 658 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40065841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174846 + ... + 175074.

It is an arithmetic number, because the mean of its divisors is an integer number (876990).

Almost surely, 2^40065840 is an apocalyptic number.

40065840 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 40065840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70159200).

40065840 is an abundant number, since it is smaller than the sum of its proper divisors (100252560).

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

40065840 is an equidigital number, since it uses as much as digits as its factorization.

40065840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 40065840 is about 6329.7582892240. The cubic root of 40065840 is about 342.1827278374.

The spelling of 40065840 in words is "forty million, sixty-five thousand, eight hundred forty".