39797820 has 72 divisors (see below), whose sum is σ = 125981856. Its totient is φ = 10150272.

The previous prime is 39797819. The next prime is 39797869. The reversal of 39797820 is 2879793.

39797820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667 + ... + 8946.

It is an arithmetic number, because the mean of its divisors is an integer number (1749748).

Almost surely, 2^39797820 is an apocalyptic number.

39797820 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 39797820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62990928).

39797820 is an abundant number, since it is smaller than the sum of its proper divisors (86184036).

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

39797820 is a wasteful number, since it uses less digits than its factorization.

39797820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9651 (or 9646 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 39797820 is about 6308.5513392537. The cubic root of 39797820 is about 341.4180108960.

The spelling of 39797820 in words is "thirty-nine million, seven hundred ninety-seven thousand, eight hundred twenty".