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19954089 = 3214892
BaseRepresentation
bin100110000011…
…1100110101001
31101112202212100
41030013212221
520102012324
61551404013
7331415121
oct114074651
941482770
1019954089
1110299891
126823609
13419856c
142915c81
151b424c9
hex13079a9

19954089 has 9 divisors (see below), whose sum is σ = 28841943. Its totient is φ = 13293792.

The previous prime is 19954061. The next prime is 19954093. The reversal of 19954089 is 98045991.

The square root of 19954089 is 4467.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4272489 + 15681600 = 2067^2 + 3960^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19954089 - 211 = 19952041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19954189) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12657 + ... + 14145.

Almost surely, 219954089 is an apocalyptic number.

19954089 is the 4467-th square number.

19954089 is the 2234-th centered octagonal number.

It is an amenable number.

19954089 is a deficient number, since it is larger than the sum of its proper divisors (8887854).

19954089 is an frugal number, since it uses more digits than its factorization.

19954089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The cubic root of 19954089 is about 271.2338998138.

It can be divided in two parts, 1995 and 4089, that added together give a square (6084 = 782).

The spelling of 19954089 in words is "nineteen million, nine hundred fifty-four thousand, eighty-nine".

Divisors: 1 3 9 1489 4467 13401 2217121 6651363 19954089