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155140 = 2257757
BaseRepresentation
bin100101111000000100
321212210221
4211320010
514431030
63154124
71214206
oct457004
9255727
10155140
11a6617
1275944
13557cb
1440776
1530e7a
hex25e04

155140 has 12 divisors (see below), whose sum is σ = 325836. Its totient is φ = 62048.

The previous prime is 155137. The next prime is 155153. The reversal of 155140 is 41551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 61504 = 306^2 + 248^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3859 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (27153).

2155140 is an apocalyptic number.

155140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155140 is an abundant number, since it is smaller than the sum of its proper divisors (170696).

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

155140 is a wasteful number, since it uses less digits than its factorization.

155140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7766 (or 7764 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 155140 is about 393.8781537481. The cubic root of 155140 is about 53.7330214988.

Adding to 155140 its reverse (41551), we get a palindrome (196691).

The spelling of 155140 in words is "one hundred fifty-five thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 7757 15514 31028 38785 77570 155140