39864140 has 48 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 15267840.

The previous prime is 39864127. The next prime is 39864161. The reversal of 39864140 is 4146893.

It is a super-3 number, since 3×39864140³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39864140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69776 + ... + 70344.

It is an arithmetic number, because the mean of its divisors is an integer number (1819440).

Almost surely, 2^39864140 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 39864140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43666560).

39864140 is an abundant number, since it is smaller than the sum of its proper divisors (47468980).

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

39864140 is a wasteful number, since it uses less digits than its factorization.

39864140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 39864140 is about 6313.8055085661. The cubic root of 39864140 is about 341.6075545829.

It can be divided in two parts, 39864 and 140, that added together give a palindrome (40004).

The spelling of 39864140 in words is "thirty-nine million, eight hundred sixty-four thousand, one hundred forty".