390012500 has 72 divisors (see below), whose sum is σ = 875053368. Its totient is φ = 152000000.

The previous prime is 390012499. The next prime is 390012517. The reversal of 390012500 is 5210093.

It can be written as a sum of positive squares in 12 ways, for example, as 261598276 + 128414224 = 16174^2 + 11332^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 512120 + ... + 512880.

It is an arithmetic number, because the mean of its divisors is an integer number (12153519).

Almost surely, 2^390012500 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 390012500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437526684).

390012500 is an abundant number, since it is smaller than the sum of its proper divisors (485040868).

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

390012500 is an equidigital number, since it uses as much as digits as its factorization.

390012500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 390012500 is about 19748.7341366478. The cubic root of 390012500 is about 730.6221630318.

Adding to 390012500 its reverse (5210093), we get a palindrome (395222593).

The spelling of 390012500 in words is "three hundred ninety million, twelve thousand, five hundred".