40391568 has 240 divisors, whose sum is σ = 143621760. Its totient is φ = 10637568.

The previous prime is 40391551. The next prime is 40391579. The reversal of 40391568 is 86519304.

40391568 is a `hidden beast` number, since 4 + 0 + 3 + 91 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1091646 + ... + 1091682.

It is an arithmetic number, because the mean of its divisors is an integer number (598424).

Almost surely, 2^40391568 is an apocalyptic number.

40391568 is a gapful number since it is divisible by the number (48) 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 40391568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71810880).

40391568 is an abundant number, since it is smaller than the sum of its proper divisors (103230192).

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

40391568 is a wasteful number, since it uses less digits than its factorization.

40391568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 40391568 is about 6355.4360983335. The cubic root of 40391568 is about 343.1075206838.

The spelling of 40391568 in words is "forty million, three hundred ninety-one thousand, five hundred sixty-eight".