The square root of 390625 is 625.
It is a trimorphic number since its cube, 59604644775390625, ends in 390625.
It is an Ulam number.
It is a Duffinian number.
It is a nialpdrome in base 5.
It is a self number, because there is not a number n which added to its sum of digits gives 390625.
It is an unprimeable number.
390625 is a Friedman number, since it can be written as 5^(9-6+3+2+0), using all its digits and the basic arithmetic operations.
2390625 is an apocalyptic number.
390625 is the 625-th square number.
390625 is the 313-rd centered octagonal number.
It is an amenable number.
390625 is an frugal number, since it uses more digits than its factorization.
390625 is an evil number, because the sum of its binary digits is even.
The cubic root of 390625 is about 73.1004434553.
Multiplying 390625 by its sum of digits (25), we get a 10-th power (9765625 = 510).
390625 divided by its sum of digits (25) gives a 6-th power (15625 = 56).
The spelling of 390625 in words is "three hundred ninety thousand, six hundred twenty-five".