40312440 has 192 divisors, whose sum is σ = 158708160. Its totient is φ = 8663040.

The previous prime is 40312439. The next prime is 40312463. The reversal of 40312440 is 4421304.

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

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, 42370 + ... + 43310.

It is an arithmetic number, because the mean of its divisors is an integer number (826605).

Almost surely, 2^40312440 is an apocalyptic number.

40312440 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 40312440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79354080).

40312440 is an abundant number, since it is smaller than the sum of its proper divisors (118395720).

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

40312440 is a wasteful number, since it uses less digits than its factorization.

40312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 975 counting only the distinct ones).

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

The square root of 40312440 is about 6349.2078246030. The cubic root of 40312440 is about 342.8833224057.

Adding to 40312440 its reverse (4421304), we get a palindrome (44733744).

The spelling of 40312440 in words is "forty million, three hundred twelve thousand, four hundred forty".