1725621 has 16 divisors (see below), whose sum is σ = 2436480. Its totient is φ = 1084160.

The previous prime is 1725617. The next prime is 1725641. The reversal of 1725621 is 1265271.

It is a cyclic number.

It is not a de Polignac number, because 1725621 - 2² = 1725617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1725591 and 1725600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6001 + ... + 6281.

It is an arithmetic number, because the mean of its divisors is an integer number (152280).

2^1725621 is an apocalyptic number.

It is an amenable number.

1725621 is a deficient number, since it is larger than the sum of its proper divisors (710859).

1725621 is a wasteful number, since it uses less digits than its factorization.

1725621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 840, while the sum is 24.

The square root of 1725621 is about 1313.6289430429. The cubic root of 1725621 is about 119.9449052642.

It can be divided in two parts, 1725 and 621, that multiplied together give a square (1071225 = 1035²).

The spelling of 1725621 in words is "one million, seven hundred twenty-five thousand, six hundred twenty-one".