1725320638 has 8 divisors (see below), whose sum is σ = 2593385280. Its totient is φ = 860858880.

The previous prime is 1725320629. The next prime is 1725320671. The reversal of 1725320638 is 8360235271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1725320597 and 1725320606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899523 + ... + 901438.

It is an arithmetic number, because the mean of its divisors is an integer number (324173160).

Almost surely, 2^1725320638 is an apocalyptic number.

1725320638 is a deficient number, since it is larger than the sum of its proper divisors (868064642).

1725320638 is a wasteful number, since it uses less digits than its factorization.

1725320638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801442.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1725320638 is about 41536.9791631505. The cubic root of 1725320638 is about 1199.3794564749.

The spelling of 1725320638 in words is "one billion, seven hundred twenty-five million, three hundred twenty thousand, six hundred thirty-eight".