Search a number
-
+
1220655893 = 19107600421
BaseRepresentation
bin100100011000001…
…1011101100010101
310011001212202002112
41020300123230111
54444441442033
6321042520405
742151255352
oct11060335425
93131782075
101220655893
11577034926
122a0966105
13165b772c2
14b8189629
157226ac48
hex48c1bb15

1220655893 has 8 divisors (see below), whose sum is σ = 1296911520. Its totient is φ = 1145601360.

The previous prime is 1220655881. The next prime is 1220655899. The reversal of 1220655893 is 3985560221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220655893 - 28 = 1220655637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220655893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220655899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298178 + ... + 302243.

It is an arithmetic number, because the mean of its divisors is an integer number (162113940).

Almost surely, 21220655893 is an apocalyptic number.

It is an amenable number.

1220655893 is a deficient number, since it is larger than the sum of its proper divisors (76255627).

1220655893 is a wasteful number, since it uses less digits than its factorization.

1220655893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600547.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1220655893 is about 34937.8862125344. The cubic root of 1220655893 is about 1068.7211825022.

The spelling of 1220655893 in words is "one billion, two hundred twenty million, six hundred fifty-five thousand, eight hundred ninety-three".

Divisors: 1 19 107 2033 600421 11407999 64245047 1220655893