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1291088 = 241931137
BaseRepresentation
bin100111011001101010000
32102121001002
410323031100
5312303323
643401132
713655051
oct4731520
92377032
101291088
11802017
125231a8
13362876
14258728
151a7828
hex13b350

1291088 has 40 divisors (see below), whose sum is σ = 2737920. Its totient is φ = 587520.

The previous prime is 1291079. The next prime is 1291111. The reversal of 1291088 is 8801921.

It is a self number, because there is not a number n which added to its sum of digits gives 1291088.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9356 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (68448).

21291088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368960).

1291088 is an abundant number, since it is smaller than the sum of its proper divisors (1446832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291088 is a wasteful number, since it uses less digits than its factorization.

1291088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1291088 is about 1136.2605335045. The cubic root of 1291088 is about 108.8893189549.

The spelling of 1291088 in words is "one million, two hundred ninety-one thousand, eighty-eight".

Divisors: 1 2 4 8 16 19 31 38 62 76 124 137 152 248 274 304 496 548 589 1096 1178 2192 2356 2603 4247 4712 5206 8494 9424 10412 16988 20824 33976 41648 67952 80693 161386 322772 645544 1291088