39106640 has 20 divisors (see below), whose sum is σ = 90923124. Its totient is φ = 15642624.

The previous prime is 39106637. The next prime is 39106643. The reversal of 39106640 is 4660193.

It is an interprime number because it is at equal distance from previous prime (39106637) and next prime (39106643).

It can be written as a sum of positive squares in 2 ways, for example, as 21196816 + 17909824 = 4604^2 + 4232^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39106643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244337 + ... + 244496.

Almost surely, 2^39106640 is an apocalyptic number.

It is an amenable number.

39106640 is an abundant number, since it is smaller than the sum of its proper divisors (51816484).

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

39106640 is a wasteful number, since it uses less digits than its factorization.

39106640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488846 (or 488840 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 39106640 is about 6253.5302030133. The cubic root of 39106640 is about 339.4299559863.

The spelling of 39106640 in words is "thirty-nine million, one hundred six thousand, six hundred forty".