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890843409 = 3299492
BaseRepresentation
bin110101000110010…
…011000100010001
32022002021112102100
4311012103010101
53311023442114
6224221511013
731035021051
oct6506230421
92262245370
10890843409
11417948925
1220a412469
1311273b9a1
1486455561
155331d909
hex35193111

890843409 has 9 divisors (see below), whose sum is σ = 1286903163. Its totient is φ = 593835912.

The previous prime is 890843377. The next prime is 890843423. The reversal of 890843409 is 904348098.

It is a happy number.

The square root of 890843409 is 29847.

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., 351675009 + 539168400 = 18753^2 + 23220^2 .

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

It is not a de Polignac number, because 890843409 - 25 = 890843377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (890843479) 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, 84567 + ... + 94515.

Almost surely, 2890843409 is an apocalyptic number.

890843409 is the 29847-th square number.

890843409 is the 14924-th centered octagonal number.

It is an amenable number.

890843409 is a deficient number, since it is larger than the sum of its proper divisors (396059754).

890843409 is an frugal number, since it uses more digits than its factorization.

890843409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19904 (or 9952 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The cubic root of 890843409 is about 962.2039240902.

The spelling of 890843409 in words is "eight hundred ninety million, eight hundred forty-three thousand, four hundred nine".

Divisors: 1 3 9 9949 29847 89541 98982601 296947803 890843409