1399725 has 18 divisors (see below), whose sum is σ = 2507466. Its totient is φ = 746400.

The previous prime is 1399721. The next prime is 1399733. The reversal of 1399725 is 5279931.

It can be written as a sum of positive squares in 3 ways, for example, as 2601 + 1397124 = 51^2 + 1182^2 .

It is not a de Polignac number, because 1399725 - 2² = 1399721 is a prime.

It is a Curzon number.

1399725 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399721) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 2886 + ... + 3335.

2^1399725 is an apocalyptic number.

1399725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1399725 is a deficient number, since it is larger than the sum of its proper divisors (1107741).

1399725 is a wasteful number, since it uses less digits than its factorization.

1399725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237 (or 6229 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 1399725 is about 1183.0997422027. The cubic root of 1399725 is about 111.8615689795.

The spelling of 1399725 in words is "one million, three hundred ninety-nine thousand, seven hundred twenty-five".