Search a number
-
+
1990625 = 557213
BaseRepresentation
bin111100101111111100001
310202010121212
413211333201
51002200000
6110355505
722630400
oct7457741
93663555
101990625
11113a64a
127bbb95
135490b0
1439b637
15294c35
hex1e5fe1

1990625 has 36 divisors (see below), whose sum is σ = 3116988. Its totient is φ = 1260000.

The previous prime is 1990621. The next prime is 1990643. The reversal of 1990625 is 5260991.

It can be written as a sum of positive squares in 6 ways, for example, as 1882384 + 108241 = 1372^2 + 329^2 .

It is not a de Polignac number, because 1990625 - 22 = 1990621 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1990591 and 1990600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990621) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 153119 + ... + 153131.

It is an arithmetic number, because the mean of its divisors is an integer number (86583).

21990625 is an apocalyptic number.

It is an amenable number.

1990625 is a deficient number, since it is larger than the sum of its proper divisors (1126363).

1990625 is an frugal number, since it uses more digits than its factorization.

1990625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 1990625 is about 1410.8951059522. The cubic root of 1990625 is about 125.7949339240.

The spelling of 1990625 in words is "one million, nine hundred ninety thousand, six hundred twenty-five".

Divisors: 1 5 7 13 25 35 49 65 91 125 175 245 325 455 625 637 875 1225 1625 2275 3125 3185 4375 6125 8125 11375 15925 21875 30625 40625 56875 79625 153125 284375 398125 1990625