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42861 = 3713157
BaseRepresentation
bin1010011101101101
32011210110
422131231
52332421
6530233
7235650
oct123555
964713
1042861
112a225
1220979
1316680
1411897
15ca76
hexa76d

42861 has 16 divisors (see below), whose sum is σ = 70784. Its totient is φ = 22464.

The previous prime is 42859. The next prime is 42863. The reversal of 42861 is 16824.

Adding to 42861 its reverse (16824), we get a triangular number (59685 = T345).

It can be divided in two parts, 42 and 861, that added together give a triangular number (903 = T42).

It is an interprime number because it is at equal distance from previous prime (42859) and next prime (42863).

It is not a de Polignac number, because 42861 - 21 = 42859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 8.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 351.

It is an arithmetic number, because the mean of its divisors is an integer number (4424).

242861 is an apocalyptic number.

It is an amenable number.

42861 is a deficient number, since it is larger than the sum of its proper divisors (27923).

42861 is a wasteful number, since it uses less digits than its factorization.

42861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its digits is 384, while the sum is 21.

The square root of 42861 is about 207.0289834782. The cubic root of 42861 is about 34.9961900615.

The spelling of 42861 in words is "forty-two thousand, eight hundred sixty-one".

Divisors: 1 3 7 13 21 39 91 157 273 471 1099 2041 3297 6123 14287 42861