40351440 has 80 divisors (see below), whose sum is σ = 131688000. Its totient is φ = 10192896.

The previous prime is 40351417. The next prime is 40351447. The reversal of 40351440 is 4415304.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40351447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136 + ... + 8984.

It is an arithmetic number, because the mean of its divisors is an integer number (1646100).

Almost surely, 2^40351440 is an apocalyptic number.

40351440 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 40351440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65844000).

40351440 is an abundant number, since it is smaller than the sum of its proper divisors (91336560).

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

40351440 is a wasteful number, since it uses less digits than its factorization.

40351440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8884 (or 8878 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40351440 is about 6352.2783314335. The cubic root of 40351440 is about 342.9938601581.

Adding to 40351440 its reverse (4415304), we get a palindrome (44766744).

The spelling of 40351440 in words is "forty million, three hundred fifty-one thousand, four hundred forty".