40231440 has 120 divisors (see below), whose sum is σ = 137187648. Its totient is φ = 10563840.

The previous prime is 40231427. The next prime is 40231447. The reversal of 40231440 is 4413204.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40231447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50727 + ... + 51513.

Almost surely, 2^40231440 is an apocalyptic number.

40231440 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 40231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68593824).

40231440 is an abundant number, since it is smaller than the sum of its proper divisors (96956208).

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

40231440 is a wasteful number, since it uses less digits than its factorization.

40231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40231440 is about 6342.8258686488. The cubic root of 40231440 is about 342.6535159923.

Adding to 40231440 its reverse (4413204), we get a palindrome (44644644).

The spelling of 40231440 in words is "forty million, two hundred thirty-one thousand, four hundred forty".