39959640 has 192 divisors, whose sum is σ = 150845760. Its totient is φ = 8985600.

The previous prime is 39959629. The next prime is 39959659. The reversal of 39959640 is 4695993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254442 + ... + 254598.

It is an arithmetic number, because the mean of its divisors is an integer number (785655).

Almost surely, 2^39959640 is an apocalyptic number.

39959640 is a gapful number since it is divisible by the number (30) 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 39959640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75422880).

39959640 is an abundant number, since it is smaller than the sum of its proper divisors (110886120).

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

39959640 is a wasteful number, since it uses less digits than its factorization.

39959640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 39959640 is about 6321.3637769076. The cubic root of 39959640 is about 341.8801262451.

The spelling of 39959640 in words is "thirty-nine million, nine hundred fifty-nine thousand, six hundred forty".