40623640 has 48 divisors (see below), whose sum is σ = 94875840. Its totient is φ = 15638400.

The previous prime is 40623607. The next prime is 40623643. The reversal of 40623640 is 4632604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40623643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224350 + ... + 224530.

It is an arithmetic number, because the mean of its divisors is an integer number (1976580).

Almost surely, 2^40623640 is an apocalyptic number.

40623640 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 40623640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47437920).

40623640 is an abundant number, since it is smaller than the sum of its proper divisors (54252200).

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

40623640 is a wasteful number, since it uses less digits than its factorization.

40623640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 40623640 is about 6373.6677039206. The cubic root of 40623640 is about 343.7633806362.

The spelling of 40623640 in words is "forty million, six hundred twenty-three thousand, six hundred forty".