40643232 has 96 divisors (see below), whose sum is σ = 125927424. Its totient is φ = 11232000.

The previous prime is 40643219. The next prime is 40643233. The reversal of 40643232 is 23234604.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643233) 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, 19857 + ... + 21807.

It is an arithmetic number, because the mean of its divisors is an integer number (1311744).

Almost surely, 2^40643232 is an apocalyptic number.

40643232 is a gapful number since it is divisible by the number (42) 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 40643232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62963712).

40643232 is an abundant number, since it is smaller than the sum of its proper divisors (85284192).

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

40643232 is a wasteful number, since it uses less digits than its factorization.

40643232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1994 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 40643232 is about 6375.2044673093. The cubic root of 40643232 is about 343.8186352426.

Adding to 40643232 its reverse (23234604), we get a palindrome (63877836).

The spelling of 40643232 in words is "forty million, six hundred forty-three thousand, two hundred thirty-two".