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217442 = 22329163
BaseRepresentation
bin110101000101100010
3102001021102
4311011202
523424232
64354402
71563641
oct650542
9361242
10217442
11139405
12a5a02
1377c84
1459358
1544662
hex35162

217442 has 16 divisors (see below), whose sum is σ = 354240. Its totient is φ = 99792.

The previous prime is 217439. The next prime is 217457. The reversal of 217442 is 244712.

It is a d-powerful number, because it can be written as 211 + 1 + 47 + 74 + 48 + 217 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (22140).

2217442 is an apocalyptic number.

217442 is a deficient number, since it is larger than the sum of its proper divisors (136798).

217442 is a wasteful number, since it uses less digits than its factorization.

217442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217.

The product of its digits is 448, while the sum is 20.

The square root of 217442 is about 466.3067659814. The cubic root of 217442 is about 60.1332224957.

The spelling of 217442 in words is "two hundred seventeen thousand, four hundred forty-two", and thus it is an iban number.

Divisors: 1 2 23 29 46 58 163 326 667 1334 3749 4727 7498 9454 108721 217442