39120820 has 24 divisors (see below), whose sum is σ = 82457928. Its totient is φ = 15590400.

The previous prime is 39120799. The next prime is 39120821. The reversal of 39120820 is 2802193.

It can be written as a sum of positive squares in 4 ways, for example, as 11115556 + 28005264 = 3334^2 + 5292^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39120821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 9100.

It is an arithmetic number, because the mean of its divisors is an integer number (3435747).

Almost surely, 2^39120820 is an apocalyptic number.

It is an amenable number.

39120820 is an abundant number, since it is smaller than the sum of its proper divisors (43337108).

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

39120820 is a wasteful number, since it uses less digits than its factorization.

39120820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7251 (or 7249 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 39120820 is about 6254.6638598729. The cubic root of 39120820 is about 339.4709766003.

The spelling of 39120820 in words is "thirty-nine million, one hundred twenty thousand, eight hundred twenty".