39393940 has 24 divisors (see below), whose sum is σ = 86325120. Its totient is φ = 15072288.

The previous prime is 39393899. The next prime is 39393971. The reversal of 39393940 is 4939393.

It is a junction number, because it is equal to n+sod(n) for n = 39393893 and 39393902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42360 + ... + 43279.

It is an arithmetic number, because the mean of its divisors is an integer number (3596880).

Almost surely, 2^39393940 is an apocalyptic number.

It is an amenable number.

39393940 is an abundant number, since it is smaller than the sum of its proper divisors (46931180).

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

39393940 is a wasteful number, since it uses less digits than its factorization.

39393940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85671 (or 85669 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 39393940 is about 6276.4591928889. The cubic root of 39393940 is about 340.2591449924.

The spelling of 39393940 in words is "thirty-nine million, three hundred ninety-three thousand, nine hundred forty".