39009900 has 72 divisors (see below), whose sum is σ = 119523600. Its totient is φ = 9789440.

The previous prime is 39009881. The next prime is 39009913. The reversal of 39009900 is 990093.

It is a Harshad number since it is a multiple of its sum of digits (30).

39009900 is a modest number, since divided by 9900 gives 3900 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1276 + ... + 8924.

It is an arithmetic number, because the mean of its divisors is an integer number (1660050).

Almost surely, 2^39009900 is an apocalyptic number.

39009900 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 39009900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59761800).

39009900 is an abundant number, since it is smaller than the sum of its proper divisors (80513700).

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

39009900 is a wasteful number, since it uses less digits than its factorization.

39009900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7683 (or 7676 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 39009900 is about 6245.7905824643. The cubic root of 39009900 is about 339.1498367398.

Adding to 39009900 its reverse (990093), we get a palindrome (39999993).

The spelling of 39009900 in words is "thirty-nine million, nine thousand, nine hundred".