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721825 = 52132221
BaseRepresentation
bin10110000001110100001
31100200011021
42300032201
5141044300
623245441
76064306
oct2601641
91320137
10721825
11453355
122a9881
131c3720
1414b0ad
15e3d1a
hexb03a1

721825 has 12 divisors (see below), whose sum is σ = 964348. Its totient is φ = 532800.

The previous prime is 721793. The next prime is 721843. The reversal of 721825 is 528127.

It can be written as a sum of positive squares in 6 ways, for example, as 42849 + 678976 = 207^2 + 824^2 .

It is not a de Polignac number, because 721825 - 25 = 721793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721825.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 786 + ... + 1435.

2721825 is an apocalyptic number.

It is an amenable number.

721825 is a deficient number, since it is larger than the sum of its proper divisors (242523).

721825 is a wasteful number, since it uses less digits than its factorization.

721825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244 (or 2239 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 721825 is about 849.6028483945. The cubic root of 721825 is about 89.7037584797.

The spelling of 721825 in words is "seven hundred twenty-one thousand, eight hundred twenty-five".

Divisors: 1 5 13 25 65 325 2221 11105 28873 55525 144365 721825