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138811122 = 23227772
BaseRepresentation
bin10000100011000…
…01011011110010
3100200012100001200
420101201123302
5241013423442
621435112030
73303606102
oct1021413362
9320170050
10138811122
117139a93a
123a5a2616
13229b2178
1414615202
15c2be34c
hex84616f2

138811122 has 18 divisors (see below), whose sum is σ = 300865773. Its totient is φ = 46253712.

The previous prime is 138811111. The next prime is 138811147. The reversal of 138811122 is 221118831.

It can be written as a sum of positive squares in 2 ways, for example, as 119705481 + 19105641 = 10941^2 + 4371^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅BA, here for A=2, B=8331.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 48598 + ... + 51374.

Almost surely, 2138811122 is an apocalyptic number.

138811122 is an abundant number, since it is smaller than the sum of its proper divisors (162054651).

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

138811122 is an frugal number, since it uses more digits than its factorization.

138811122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562 (or 2782 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 138811122 is about 11781.8131881303. The cubic root of 138811122 is about 517.7754103581.

Adding to 138811122 its reverse (221118831), we get a palindrome (359929953).

The spelling of 138811122 in words is "one hundred thirty-eight million, eight hundred eleven thousand, one hundred twenty-two".

Divisors: 1 2 3 6 9 18 2777 5554 8331 16662 24993 49986 7711729 15423458 23135187 46270374 69405561 138811122