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1280872 = 23295521
BaseRepresentation
bin100111000101101101000
32102002000201
410320231220
5311441442
643241544
713613215
oct4705550
92362021
101280872
117a537a
125192b4
1335b018
14254b0c
151a47b7
hex138b68

1280872 has 16 divisors (see below), whose sum is σ = 2484900. Its totient is φ = 618240.

The previous prime is 1280869. The next prime is 1280887. The reversal of 1280872 is 2780821.

It can be written as a sum of positive squares in 2 ways, for example, as 1267876 + 12996 = 1126^2 + 114^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1280872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2529 + ... + 2992.

21280872 is an apocalyptic number.

It is an amenable number.

1280872 is a deficient number, since it is larger than the sum of its proper divisors (1204028).

1280872 is a wasteful number, since it uses less digits than its factorization.

1280872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1280872 is about 1131.7561574827. The cubic root of 1280872 is about 108.6013550270.

It can be divided in two parts, 12808 and 72, that added together give a triangular number (12880 = T160).

The spelling of 1280872 in words is "one million, two hundred eighty thousand, eight hundred seventy-two".

Divisors: 1 2 4 8 29 58 116 232 5521 11042 22084 44168 160109 320218 640436 1280872