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155642 = 2591319
BaseRepresentation
bin100101111111111010
321220111112
4211333322
514440032
63200322
71215524
oct457772
9256445
10155642
11a6a33
12760a2
1355ac6
1440a14
15311b2
hex25ffa

155642 has 8 divisors (see below), whose sum is σ = 237600. Its totient is φ = 76444.

The previous prime is 155627. The next prime is 155653. The reversal of 155642 is 246551.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542 + ... + 777.

It is an arithmetic number, because the mean of its divisors is an integer number (29700).

155642 is a Friedman number, since it can be written as 152*4^5-6, using all its digits and the basic arithmetic operations.

2155642 is an apocalyptic number.

155642 is a deficient number, since it is larger than the sum of its proper divisors (81958).

155642 is a wasteful number, since it uses less digits than its factorization.

155642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380.

The product of its digits is 1200, while the sum is 23.

The square root of 155642 is about 394.5148919876. The cubic root of 155642 is about 53.7909153043.

Subtracting 155642 from its reverse (246551), we obtain a palindrome (90909).

It can be divided in two parts, 155 and 642, that added together give a palindrome (797).

The spelling of 155642 in words is "one hundred fifty-five thousand, six hundred forty-two".

Divisors: 1 2 59 118 1319 2638 77821 155642