40639500 has 144 divisors (see below), whose sum is σ = 140029344. Its totient is φ = 9840000.

The previous prime is 40639463. The next prime is 40639507. The reversal of 40639500 is 593604.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (40639507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49090 + ... + 49910.

It is an arithmetic number, because the mean of its divisors is an integer number (972426).

Almost surely, 2^40639500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40639500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70014672).

40639500 is an abundant number, since it is smaller than the sum of its proper divisors (99389844).

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

40639500 is a wasteful number, since it uses less digits than its factorization.

40639500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 40639500 is about 6374.9117640952. The cubic root of 40639500 is about 343.8081113878.

The spelling of 40639500 in words is "forty million, six hundred thirty-nine thousand, five hundred".