1725390989 has 24 divisors (see below), whose sum is σ = 2104866360. Its totient is φ = 1408264704.

The previous prime is 1725390971. The next prime is 1725391001. The reversal of 1725390989 is 9890935271.

It can be written as a sum of positive squares in 4 ways, for example, as 96864964 + 1628526025 = 9842^2 + 40355^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1725390989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1725390989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725390089) 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, 95417 + ... + 112049.

It is an arithmetic number, because the mean of its divisors is an integer number (87702765).

Almost surely, 2^1725390989 is an apocalyptic number.

It is an amenable number.

1725390989 is a deficient number, since it is larger than the sum of its proper divisors (379475371).

1725390989 is a wasteful number, since it uses less digits than its factorization.

1725390989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16749 (or 16742 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 1725390989 is about 41537.8260023319. The cubic root of 1725390989 is about 1199.3957580627.

The spelling of 1725390989 in words is "one billion, seven hundred twenty-five million, three hundred ninety thousand, nine hundred eighty-nine".