39649960 has 128 divisors (see below), whose sum is σ = 111456000. Its totient is φ = 12386304.

The previous prime is 39649957. The next prime is 39649963. The reversal of 39649960 is 6994693.

It is an interprime number because it is at equal distance from previous prime (39649957) and next prime (39649963).

It is a self number, because there is not a number n which added to its sum of digits gives 39649960.

It is not an unprimeable number, because it can be changed into a prime (39649963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154152 + ... + 154408.

It is an arithmetic number, because the mean of its divisors is an integer number (870750).

Almost surely, 2^39649960 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 39649960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55728000).

39649960 is an abundant number, since it is smaller than the sum of its proper divisors (71806040).

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

39649960 is a wasteful number, since it uses less digits than its factorization.

39649960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 39649960 is about 6296.8214203676. The cubic root of 39649960 is about 340.9946651384.

It can be divided in two parts, 3964 and 9960, that added together give a square (13924 = 118²).

The spelling of 39649960 in words is "thirty-nine million, six hundred forty-nine thousand, nine hundred sixty".