39923640 has 48 divisors (see below), whose sum is σ = 129753000. Its totient is φ = 10646208.

The previous prime is 39923621. The next prime is 39923647. The reversal of 39923640 is 4632993.

It is a happy number.

39923640 is a `hidden beast` number, since 3 + 9 + 9 + 2 + 3 + 640 = 666.

39923640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 39923595 and 39923604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39923647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55090 + ... + 55809.

Almost surely, 2^39923640 is an apocalyptic number.

39923640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39923640 is an abundant number, since it is smaller than the sum of its proper divisors (89829360).

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

39923640 is a wasteful number, since it uses less digits than its factorization.

39923640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110916 (or 110909 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 39923640 is about 6318.5156484731. The cubic root of 39923640 is about 341.7774277687. Note that the first 3 decimals are identical.

The spelling of 39923640 in words is "thirty-nine million, nine hundred twenty-three thousand, six hundred forty".