1890625005 has 24 divisors (see below), whose sum is σ = 3357015480. Its totient is φ = 983738880.

The previous prime is 1890624979. The next prime is 1890625007. The reversal of 1890625005 is 5005260981.

It is a happy number.

1890625005 is a `hidden beast` number, since 1 + 8 + 90 + 62 + 500 + 5 = 666.

1890625005 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10361961 + 1880263044 = 3219^2 + 43362^2 .

It is not a de Polignac number, because 1890625005 - 2⁹ = 1890624493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890625007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 510520 + ... + 514209.

It is an arithmetic number, because the mean of its divisors is an integer number (139875645).

Almost surely, 2^1890625005 is an apocalyptic number.

1890625005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1890625005 is a deficient number, since it is larger than the sum of its proper divisors (1466390475).

1890625005 is a wasteful number, since it uses less digits than its factorization.

1890625005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024781 (or 1024778 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1890625005 is about 43481.3178848112. The cubic root of 1890625005 is about 1236.5218619022.

Adding to 1890625005 its reverse (5005260981), we get a palindrome (6895885986).

The spelling of 1890625005 in words is "one billion, eight hundred ninety million, six hundred twenty-five thousand, five".