40232640 has 112 divisors (see below), whose sum is σ = 146011392. Its totient is φ = 9194496.

The previous prime is 40232623. The next prime is 40232651. The reversal of 40232640 is 4623204.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3727 + ... + 9713.

Almost surely, 2^40232640 is an apocalyptic number.

40232640 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 40232640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73005696).

40232640 is an abundant number, since it is smaller than the sum of its proper divisors (105778752).

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

40232640 is a wasteful number, since it uses less digits than its factorization.

40232640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014 (or 6004 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 40232640 is about 6342.9204630044. The cubic root of 40232640 is about 342.6569227817.

Adding to 40232640 its reverse (4623204), we get a palindrome (44855844).

The spelling of 40232640 in words is "forty million, two hundred thirty-two thousand, six hundred forty".