39669864 has 64 divisors (see below), whose sum is σ = 108864000. Its totient is φ = 11970816.

The previous prime is 39669827. The next prime is 39669913. The reversal of 39669864 is 46896693.

It is a super-3 number, since 3×39669864³ (a number of 24 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 15337 + ... + 17735.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^39669864 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 39669864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54432000).

39669864 is an abundant number, since it is smaller than the sum of its proper divisors (69194136).

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

39669864 is a wasteful number, since it uses less digits than its factorization.

39669864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474 (or 2470 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 51.

The square root of 39669864 is about 6298.4017020193. The cubic root of 39669864 is about 341.0517145649.

It can be divided in two parts, 39 and 669864, that added together give a triangular number (669903 = T₁₁₅₇).

The spelling of 39669864 in words is "thirty-nine million, six hundred sixty-nine thousand, eight hundred sixty-four".