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122785 = 5131889
BaseRepresentation
bin11101111110100001
320020102121
4131332201
512412120
62344241
71020655
oct357641
9206377
10122785
1184283
125b081
1343b70
1432a65
15265aa
hex1dfa1

122785 has 8 divisors (see below), whose sum is σ = 158760. Its totient is φ = 90624.

The previous prime is 122777. The next prime is 122789. The reversal of 122785 is 587221.

It can be written as a sum of positive squares in 4 ways, for example, as 1681 + 121104 = 41^2 + 348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122785 - 23 = 122777 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2122785 is an apocalyptic number.

It is an amenable number.

122785 is a deficient number, since it is larger than the sum of its proper divisors (35975).

122785 is a wasteful number, since it uses less digits than its factorization.

122785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907.

The product of its digits is 1120, while the sum is 25.

The square root of 122785 is about 350.4069063246. The cubic root of 122785 is about 49.7029048526.

Subtracting from 122785 its sum of digits (25), we obtain a triangular number (122760 = T495).

The spelling of 122785 in words is "one hundred twenty-two thousand, seven hundred eighty-five".

Divisors: 1 5 13 65 1889 9445 24557 122785